diff --git a/mcc_concepts.h b/mcc_concepts.h
index fbbc2b2..7156946 100644
--- a/mcc_concepts.h
+++ b/mcc_concepts.h
@@ -147,6 +147,11 @@ concept mcc_fp_type_like_c =
 
 /*                          GEOMETRICAL ANGLE REPRESENTATION CLASS CONCEPT                           */
 
+/*    REQUIREMENT: in the MCC-library it is assumed that an arithmetic representation of angles are measured in the
+                   radians!!! This means that possible conversion operator 'SOME_USER_ANGLE_CLASS::operator double()'
+                   must return an angle in radians!
+ */
+
 template <typename T>
 concept mcc_angle_c = mcc_fp_type_like_c<T> && requires(T v, double vd) {
     // mandatory arithmetic operations
@@ -783,6 +788,13 @@ struct mcc_telemetry_interface_t {
     {
         return std::forward<SelfT>(self).setTarget(pt);
     }
+
+    // get entered target position
+    template <std::derived_from<mcc_telemetry_interface_t> SelfT>
+    RetT setTarget(this SelfT&& self, mcc_skypoint_c auto* pt)
+    {
+        return std::forward<SelfT>(self).getTarget(pt);
+    }
 };
 
 template <typename T>
diff --git a/mcc_constants.h b/mcc_constants.h
index bc62a65..4e521f1 100644
--- a/mcc_constants.h
+++ b/mcc_constants.h
@@ -26,6 +26,8 @@ constexpr double MCC_TWO_PI = std::numbers::pi * 2.0;
 
 static constexpr double MCC_SIDERAL_TO_UT1_RATIO = 1.002737909350795;  // sideral/UT1
 
+static constexpr double MCC_J2000_MJD = 51544.5;
+
 
 // a value to represent of infinite time duration according to type of duration representation
 template <traits::mcc_time_duration_c DT>
diff --git a/mcc_ser.h b/mcc_ser.h
new file mode 100644
index 0000000..32dac55
--- /dev/null
+++ b/mcc_ser.h
@@ -0,0 +1,447 @@
+#pragma once
+
+#include "mcc_coordinate.h"
+#include "mcc_serialization_common.h"
+
+namespace mcc::impl
+{
+
+enum class MccSerializerErrorCode : int {
+    ERROR_OK,
+    ERROR_UNDERLYING_SERIALIZER,
+    ERROR_INVALID_EPOCH,
+    ERROR_COORD_TRANSFORM
+};
+
+}  // namespace mcc::impl
+
+
+
+namespace std
+{
+
+template <>
+class is_error_code_enum<mcc::impl::MccSerializerErrorCode> : public true_type
+{
+};
+
+}  // namespace std
+
+
+namespace mcc::impl
+{
+
+// error category
+struct MccSerializerCategory : public std::error_category {
+    MccSerializerCategory() : std::error_category() {}
+
+    const char* name() const noexcept
+    {
+        return "MCC-SERIALIZER-ERR-CATEGORY";
+    }
+
+    std::string message(int ec) const
+    {
+        MccSerializerErrorCode err = static_cast<MccSerializerErrorCode>(ec);
+
+        switch (err) {
+            case MccSerializerErrorCode::ERROR_OK:
+                return "OK";
+            case MccSerializerErrorCode::ERROR_UNDERLYING_SERIALIZER:
+                return "error returned by underlying serializer";
+            case MccSerializerErrorCode::ERROR_INVALID_EPOCH:
+                return "invalid coordinate epoch";
+            case MccSerializerErrorCode::ERROR_COORD_TRANSFORM:
+                return "coordinates transformation error";
+            default:
+                return "UNKNOWN";
+        }
+    }
+
+    static const MccSerializerCategory& get()
+    {
+        static const MccSerializerCategory constInst;
+        return constInst;
+    }
+};
+
+
+inline std::error_code make_error_code(MccSerializerErrorCode ec)
+{
+    return std::error_code(static_cast<int>(ec), MccSerializerCategory::get());
+}
+
+
+/*    BASE SERIALIZER CLASS (FOR IMPLEMENTATIONS BELOW)    */
+
+struct MccSerializerBase : mcc_serializer_interface_t<MccError> {
+    virtual ~MccSerializerBase() = default;
+
+    using typename mcc_serializer_interface_t<MccError>::error_t;
+
+protected:
+    MccSerializerBase() = default;
+
+    enum CoordType { CO_LON, CO_LAT };
+
+    static void addElemDelimiter(traits::mcc_output_char_range auto& output,
+                                 mcc_serialization_params_c auto const& params)
+    {
+        std::format_to(std::back_inserter(output), "{}", params.elem_delim);
+    }
+
+
+    static void addSeqDelimiter(traits::mcc_output_char_range auto& output,
+                                mcc_serialization_params_c auto const& params)
+    {
+        std::format_to(std::back_inserter(output), "{}", params.seq_delim);
+    }
+
+
+    // set serialized angle format according to coordinates pair format and type of
+    // serializing mcc_coord_pair_c::pairKind
+    template <MccCoordPairKind PAIRKIND, CoordType TYPE = MccSerializerBase::CO_LON>
+    static void angleFormatFromCoordPairType(mcc_serialization_params_c auto& pars)
+    {
+        if (pars.coordpair_format == MccSerializedCoordPairFormat::MCC_SERIALIZED_FORMAT_DEGREES) {
+            pars.angle_format = MccSerializedAngleFormat::MCC_SERIALIZED_FORMAT_DEGREES;
+        } else {  // format to sexagesimal form according to celestial coordinate type
+            if constexpr (TYPE == MccSerializerBase::CO_LON) {
+                if (pars.coordpair_format == MccSerializedCoordPairFormat::MCC_SERIALIZED_FORMAT_SXGM_DEGDEG) {
+                    pars.angle_format = MccSerializedAngleFormat::MCC_SERIALIZED_FORMAT_SXGM_DEGS;
+                } else if (pars.coordpair_format == MccSerializedCoordPairFormat::MCC_SERIALIZED_FORMAT_SXGM_HOURDEG) {
+                    if constexpr (PAIRKIND == MccCoordPairKind::COORDS_KIND_AZZD ||
+                                  PAIRKIND == MccCoordPairKind::COORDS_KIND_AZALT ||
+                                  PAIRKIND == MccCoordPairKind::COORDS_KIND_XY ||
+                                  PAIRKIND == MccCoordPairKind::COORDS_KIND_GENERIC) {  // azimuth is in degrees
+                        pars.angle_format = MccSerializedAngleFormat::MCC_SERIALIZED_FORMAT_SXGM_DEGS;
+                    } else {  // RA or HA
+                        pars.angle_format = MccSerializedAngleFormat::MCC_SERIALIZED_FORMAT_SXGM_HOURS;
+                    }
+                } else {
+                    // !!!!!!!!!!!!!!!!!!
+                }
+            } else {  // Y-coordinates (co-latitude one, DEC, ALT, ZD, generic X) is always in degrees for celestial
+                // point
+                pars.angle_format = MccSerializedAngleFormat::MCC_SERIALIZED_FORMAT_SXGM_DEGS;
+            }
+        }
+    }
+
+    template <typename VT, typename R>
+        requires(std::ranges::input_range<R> && std::same_as<VT, std::ranges::range_value_t<R>>)
+    static error_t serializeRange(mcc_serializer_c auto& sr,
+                                  R const& r,
+                                  traits::mcc_output_char_range auto& output,
+                                  mcc_serialization_params_c auto const& params)
+    {
+        size_t i = 0, N = std::ranges::size(r);
+
+        for (auto const& el : r) {
+            auto err = sr(output, el, params);
+            if (err) {
+                return mcc_deduced_err(err, MccSerializerErrorCode::ERROR_UNDERLYING_SERIALIZER);
+            }
+            if (++i < N) {
+                MccSerializerBase::addSeqDelimiter(output, params);
+            }
+        }
+
+        return MccSerializerErrorCode::ERROR_OK;
+    }
+};
+
+
+/*    MAIN (FALLBACK) TEMPLATED IMPLEMENTATION    */
+
+template <typename VT>
+struct MccSerializer : MccSerializerBase {
+    constexpr static std::string_view serializerName{"MCC-FALLBACK-SERIALIZER"};
+
+    template <typename ParamsT = std::nullptr_t>
+    error_t operator()(traits::mcc_output_char_range auto& output, VT const& value, ParamsT const& params = nullptr)
+    {
+        if constexpr (std::formattable<VT, char>) {
+        } else if constexpr (std::convertible_to<VT, std::string>) {
+            auto err = MccSerializer<std::string>{}(output, static_cast<std::string>(value), params);
+            if (err) {
+                return mcc_deduced_err(err, MccSerializerErrorCode::ERROR_UNDERLYING_SERIALIZER);
+            }
+        } else if constexpr (std::ranges::range<VT>) {
+            using value_t = std::remove_cv_t<std::ranges::range_value_t<VT>>;
+
+            // special range (character sequence)
+            if constexpr (std::same_as<value_t, char>) {
+                std::string str;
+                std::ranges::copy(value, std::back_inserter(str));
+
+                auto err = MccSerializer<std::string>{}(output, str, params);
+                if (err) {
+                    return mcc_deduced_err(err, MccSerializerErrorCode::ERROR_UNDERLYING_SERIALIZER);
+                }
+
+            } else {
+                MccSerializer<value_t> sr;
+
+                return MccSerializerBase::serializeRange<value_t>(sr, value, output, params);
+            }
+        } else {
+            static_assert(false, "UNSUPPORTED TYPE!!!");
+        }
+
+        return MccSerializerErrorCode::ERROR_OK;
+    }
+};
+
+
+/*                          SPECIALIZATION FOR THE SOME CONCEPTS                            */
+
+/*    std::chrono::sys_time variants and its sequence    */
+
+template <typename VT>
+    requires traits::mcc_systime_c<VT>
+struct MccSerializer<VT> : MccSerializerBase {
+    virtual ~MccSerializer() = default;
+
+    constexpr static std::string_view serializerName{"MCC-SYSTIME-SERIALIZER"};
+
+    template <typename ParamsT = std::nullptr_t>
+    error_t operator()(traits::mcc_output_char_range auto& output, VT const& value, ParamsT const& params = nullptr)
+    {
+        std::vformat_to(std::back_inserter(output), params.systime_format, std::make_format_args(value));
+
+        return MccSerializerErrorCode::ERROR_OK;
+    }
+};
+
+
+template <typename VT>
+    requires(!std::is_arithmetic_v<VT> && mcc_angle_c<VT>)
+struct MccSerializer<VT> : MccSerializerBase {
+    constexpr static std::string_view serializerName{"MCC-ANGLE-SERIALIZER"};
+
+    template <typename ParamsT = std::nullptr_t>
+    error_t operator()(traits::mcc_output_char_range auto& output, VT const& value, ParamsT const& params = nullptr)
+    {
+        double v = (double)value;  // radians (see mcc_angle_c concept)
+        std::string sgm;
+
+        switch (params.angle_format) {
+            case MccSerializedAngleFormat::MCC_SERIALIZED_FORMAT_DEGREES:
+                v *= MCC_RADS_TO_DEGRESS;
+                return MccSerializer<double>{}(output, v, params);
+            case MccSerializedAngleFormat::MCC_SERIALIZED_FORMAT_SXGM_DEGS:
+                if (params.norm_sxgm) {
+                    sgm = utils::rad2sxg<true>(v, false, params.angle_prec.deg_prec);
+                } else {
+                    sgm = utils::rad2sxg<false>(v, false, params.angle_prec.deg_prec);
+                }
+
+                break;
+            case MccSerializedAngleFormat::MCC_SERIALIZED_FORMAT_SXGM_HOURS:
+                if (params.norm_sxgm) {
+                    sgm = utils::rad2sxg<true>(v, true, params.angle_prec.hour_prec);
+                } else {
+                    sgm = utils::rad2sxg<false>(v, true, params.angle_prec.hour_prec);
+                }
+
+                break;
+            default:
+                break;
+        }
+
+        auto err = MccSerializer<std::string>{}(output, sgm, params);
+        if (err) {
+            return mcc_deduced_err(err, MccSerializerErrorCode::ERROR_UNDERLYING_SERIALIZER);
+        }
+
+        return MccSerializerErrorCode::ERROR_OK;
+    };
+};
+
+
+template <mcc_coord_epoch_c VT>
+struct MccSerializer<VT> : MccSerializerBase {
+    constexpr static std::string_view serializerName{"MCC-COORD-EPOCH-SERIALIZER"};
+
+    template <typename ParamsT = std::nullptr_t>
+    error_t operator()(traits::mcc_output_char_range auto& output, VT const& value, ParamsT const& params = nullptr)
+    {
+        double jd;
+
+        switch (params.timepoint_format) {
+            case MccTimePointFormat::MCC_TIMEPOINT_FORMAT_DATE: {
+                auto tp = value.UTC();
+                auto err = MccSerializer<decltype(tp)>{}(output, tp, params);
+                return mcc_deduced_err(err, MccSerializerErrorCode::ERROR_UNDERLYING_SERIALIZER);
+            }
+            case MccTimePointFormat::MCC_TIMEPOINT_FORMAT_JEPOCH: {
+                auto ep = value.JEpoch();
+                auto err = MccSerializer<decltype(ep)>{}(output, ep, params);
+                return mcc_deduced_err(err, MccSerializerErrorCode::ERROR_UNDERLYING_SERIALIZER);
+            }
+            case MccTimePointFormat::MCC_TIMEPOINT_FORMAT_JD:
+                jd = value.MJD() + MCC_J2000_MJD;
+                break;
+            case MccTimePointFormat::MCC_TIMEPOINT_FORMAT_MJD:
+                jd = value.MJD();
+                break;
+        }
+
+
+        auto err = MccSerializer<double>{}(output, jd, params);
+
+        if (err) {
+            return mcc_deduced_err(err, MccSerializerErrorCode::ERROR_UNDERLYING_SERIALIZER);
+        }
+
+        return MccSerializerErrorCode::ERROR_OK;
+    }
+};
+
+
+template <mcc_coord_pair_c VT>
+struct MccSerializer<VT> : MccSerializerBase {
+    constexpr static std::string_view serializerName{"MCC-COORD-PAIR-SERIALIZER"};
+
+    template <typename ParamsT = std::nullptr_t>
+    error_t operator()(traits::mcc_output_char_range auto& output, VT const& value, ParamsT const& params = nullptr)
+    {
+        std::conditional_t<std::is_null_pointer_v<ParamsT>, std::nullptr_t, mcc_serialization_params_t> pars =
+            std::is_null_pointer_v<ParamsT> ? nullptr : params;
+
+        pars.norm_sxgm = true;
+        pars.coordpair_format = MccSerializedCoordPairFormat::MCC_SERIALIZED_FORMAT_SXGM_HOURDEG;
+
+        // X-coordinate
+        MccSerializerBase::angleFormatFromCoordPairType<VT::pairKind, MccSerializerBase::CO_LON>(pars);
+
+        auto err = MccSerializer<MccAngle>{}(output, value.x(), params);
+        if (err) {
+            return mcc_deduced_err(err, MccSerializerErrorCode::ERROR_UNDERLYING_SERIALIZER);
+        }
+
+        MccSerializerBase::addElemDelimiter(output, params);
+
+        pars.norm_sxgm = false;  // do not normalize co-latitude angle
+
+        // Y-coordinate
+        MccSerializerBase::angleFormatFromCoordPairType<VT::pairKind, MccSerializerBase::CO_LAT>(pars);
+
+        err = MccSerializer<MccAngle>{}(output, value.y(), params);
+        if (err) {
+            return mcc_deduced_err(err, MccSerializerErrorCode::ERROR_UNDERLYING_SERIALIZER);
+        }
+
+        MccSerializerBase::addElemDelimiter(output, params);
+
+        // epoch
+        auto ep = value.epoch();
+        auto ep_err = MccSerializer<decltype(ep)>{}(output, ep, params);
+        if (ep_err) {
+            return mcc_deduced_err(ep_err, MccSerializerErrorCode::ERROR_UNDERLYING_SERIALIZER);
+        }
+
+
+        MccSerializerBase::addElemDelimiter(output, params);
+
+        // pair kind
+        return mcc_deduced_err(MccSerializer<std::string_view>{}(output, MccCoordPairKindToStr(VT::pairKind), params),
+                               MccSerializerErrorCode::ERROR_UNDERLYING_SERIALIZER);
+
+        return MccSerializerErrorCode::ERROR_OK;
+    }
+};
+
+
+template <mcc_skypoint_c VT>
+struct MccSerializer<VT> : MccSerializerBase {
+    constexpr static std::string_view serializerName{"MCC-SKYPOINT-SERIALIZER"};
+
+    template <typename ParamsT = std::nullptr_t>
+    error_t operator()(traits::mcc_output_char_range auto& output, VT const& value, ParamsT const& params = nullptr)
+    {
+        auto serialize_cpair = [&]<typename T>(T& cp) {
+            auto ccte_err = value.to(cp);
+            if (ccte_err) {
+                return mcc_deduced_err(ccte_err, MccSerializerErrorCode::ERROR_COORD_TRANSFORM);
+            }
+
+            auto err = MccSerializer<T>{}(output, cp, params);
+            if (err) {
+                return mcc_deduced_err(err, MccSerializerErrorCode::ERROR_UNDERLYING_SERIALIZER);
+            }
+
+            return MccSerializerErrorCode::ERROR_OK;
+        };
+
+        switch (value.pairKind()) {
+            case MccCoordPairKind::COORDS_KIND_RADEC_ICRS: {
+                MccSkyRADEC_ICRS cp;
+                return serialize_cpair(cp);
+            }
+            case MccCoordPairKind::COORDS_KIND_RADEC_OBS: {
+                MccSkyRADEC_OBS cp;
+                return serialize_cpair(cp);
+            }
+            case MccCoordPairKind::COORDS_KIND_RADEC_APP: {
+                MccSkyRADEC_APP cp;
+                return serialize_cpair(cp);
+            }
+            case MccCoordPairKind::COORDS_KIND_HADEC_OBS: {
+                MccSkyHADEC_OBS cp;
+                return serialize_cpair(cp);
+            }
+            case MccCoordPairKind::COORDS_KIND_HADEC_APP: {
+                MccSkyHADEC_APP cp;
+                return serialize_cpair(cp);
+            }
+            case MccCoordPairKind::COORDS_KIND_AZZD: {
+                MccSkyAZZD cp;
+                return serialize_cpair(cp);
+            }
+            case MccCoordPairKind::COORDS_KIND_AZALT: {
+                MccSkyAZALT cp;
+                return serialize_cpair(cp);
+            }
+            case MccCoordPairKind::COORDS_KIND_XY: {
+                MccGenXY cp;
+                return serialize_cpair(cp);
+            }
+            case MccCoordPairKind::COORDS_KIND_GENERIC: {
+                MccGenXY cp;
+                return serialize_cpair(cp);
+            }
+            default:
+                // !!!!!!!!!!!!
+        }
+    }
+};
+
+
+template <mcc_telemetry_data_c VT>
+struct MccSerializer<VT> : MccSerializerBase {
+    constexpr static std::string_view serializerName{"MCC-TELEMETRY-DATA-SERIALIZER"};
+
+    template <typename ParamsT = std::nullptr_t>
+    error_t operator()(traits::mcc_output_char_range auto& output, VT const& value, ParamsT const& params = nullptr)
+    {
+        // FORMAT: RA_OBS_MOUNT, DEC_OBS_MOUNT, RA_APP_MOUNT, DEC_APP_MOUNT, HA_APP_MOUNT, AZ_MOUNT, ZD_MOUNT,
+        // REFR_CORR_MOUNT, LAST, ENC_X, ENC_Y, PCM_X, PCM_Y, RA_APP_TAG, DEC_APP_TAG, AZ_TAG, ZD_TAG, TIMEPOINT
+
+        // NOTE: One must assume that the returned RA coordinates are in format of underlying celestial coordinate
+        //       transformation engine used in the mcc_skypoint_c class implementation. E.g. ERFA-library uses the
+        //       CIO-based representation of RA
+
+        std::conditional_t<std::is_null_pointer_v<ParamsT>, std::nullptr_t, mcc_serialization_params_t> pars =
+            std::is_null_pointer_v<ParamsT> ? nullptr : params;
+
+        pars.norm_sxgm = true;
+        pars.coordpair_format = MccSerializedCoordPairFormat::MCC_SERIALIZED_FORMAT_SXGM_HOURDEG;
+
+        // RA_OBS_MOUNT
+        MccSerializerBase::angleFormatFromCoordPairType<VT::pairKind, MccSerializerBase::CO_LON>(pars);
+    }
+};
+
+}  // namespace mcc::impl
diff --git a/mcc_serialization_common.h b/mcc_serialization_common.h
index 42ab720..bed1243 100644
--- a/mcc_serialization_common.h
+++ b/mcc_serialization_common.h
@@ -17,6 +17,51 @@
 namespace mcc
 {
 
+
+/*  celestial angle serialization   */
+
+enum class MccSerializedAngleFormat {
+    MCC_SERIALIZED_FORMAT_DEGREES,     // degrees as floating-point number
+    MCC_SERIALIZED_FORMAT_SXGM_HOURS,  // sexagesimal representation: hours:mins:secs
+    MCC_SERIALIZED_FORMAT_SXGM_DEGS,   // sexagesimal representation: degs:arcmins:arcsecs
+    MCC_SERIALIZED_FORMAT_UNKNOWN
+};
+
+static constexpr std::string_view MCC_SERIALIZED_ANG_FORMAT_DEGREES_STR = "SRANG-FORMAT-DEGREES";
+static constexpr std::string_view MCC_SERIALIZED_ANG_FORMAT_SXGM_HOURS_STR = "SRANG-FORMAT-SXGM_HOURDEG";
+static constexpr std::string_view MCC_SERIALIZED_ANG_FORMAT_SXGM_DEGS_STR = "SRANG-FORMAT-SXGM_DEGDEG";
+
+
+static constexpr std::string_view MccSerializedAngleFormatToStr(MccSerializedAngleFormat fmt)
+{
+    return fmt == MccSerializedAngleFormat::MCC_SERIALIZED_FORMAT_DEGREES ? MCC_SERIALIZED_ANG_FORMAT_DEGREES_STR
+           : fmt == MccSerializedAngleFormat::MCC_SERIALIZED_FORMAT_SXGM_HOURS
+               ? MCC_SERIALIZED_ANG_FORMAT_SXGM_HOURS_STR
+           : fmt == MccSerializedAngleFormat::MCC_SERIALIZED_FORMAT_SXGM_DEGS ? MCC_SERIALIZED_ANG_FORMAT_SXGM_DEGS_STR
+                                                                              : MCC_SERIALIZED_ANG_FORMAT_DEGREES_STR;
+}
+
+template <traits::mcc_input_char_range R>
+static constexpr MccSerializedAngleFormat MccSerializedAngleFormatStrToValue(R&& str)
+{
+    if constexpr (std::is_array_v<std::decay_t<R>>) {
+        return MccSerializedAngleFormatStrToValue(std::string_view{str});
+    }
+
+    const auto hash = mcc::utils::FNV1aHash(std::forward<R>(str));
+
+    return hash == mcc::utils::FNV1aHash(MCC_SERIALIZED_ANG_FORMAT_DEGREES_STR)
+               ? MccSerializedAngleFormat::MCC_SERIALIZED_FORMAT_DEGREES
+           : hash == mcc::utils::FNV1aHash(MCC_SERIALIZED_ANG_FORMAT_SXGM_HOURS_STR)
+               ? MccSerializedAngleFormat::MCC_SERIALIZED_FORMAT_SXGM_HOURS
+           : hash == mcc::utils::FNV1aHash(MCC_SERIALIZED_ANG_FORMAT_SXGM_DEGS_STR)
+               ? MccSerializedAngleFormat::MCC_SERIALIZED_FORMAT_SXGM_DEGS
+               : MccSerializedAngleFormat::MCC_SERIALIZED_FORMAT_UNKNOWN;
+}
+
+
+/*  coordinates pair serialization   */
+
 enum class MccSerializedCoordPairFormat {
     MCC_SERIALIZED_FORMAT_DEGREES,       // both angles are in  degrees as floating-point number
     MCC_SERIALIZED_FORMAT_SXGM_HOURDEG,  // X is in hour and Y is in degree sexagesimal representation
@@ -24,19 +69,19 @@ enum class MccSerializedCoordPairFormat {
     MCC_SERIALIZED_FORMAT_UNKNOWN
 };
 
-static constexpr std::string_view MCC_SERIALIZED_FORMAT_DEGREES_STR = "SRCP-FORMAT-DEGREES";
-static constexpr std::string_view MCC_SERIALIZED_FORMAT_SXGM_HOURDEG_STR = "SRCP-FORMAT-SXGM_HOURDEG";
-static constexpr std::string_view MCC_SERIALIZED_FORMAT_SXGM_DEGDEG_STR = "SRCP-FORMAT-SXGM_DEGDEG";
+static constexpr std::string_view MCC_SERIALIZED_CP_FORMAT_DEGREES_STR = "SRCP-FORMAT-DEGREES";
+static constexpr std::string_view MCC_SERIALIZED_CP_FORMAT_SXGM_HOURDEG_STR = "SRCP-FORMAT-SXGM_HOURDEG";
+static constexpr std::string_view MCC_SERIALIZED_CP_FORMAT_SXGM_DEGDEG_STR = "SRCP-FORMAT-SXGM_DEGDEG";
 
 
 static constexpr std::string_view MccSerializedCoordPairFormatToStr(MccSerializedCoordPairFormat fmt)
 {
-    return fmt == MccSerializedCoordPairFormat::MCC_SERIALIZED_FORMAT_DEGREES ? MCC_SERIALIZED_FORMAT_DEGREES_STR
+    return fmt == MccSerializedCoordPairFormat::MCC_SERIALIZED_FORMAT_DEGREES ? MCC_SERIALIZED_CP_FORMAT_DEGREES_STR
            : fmt == MccSerializedCoordPairFormat::MCC_SERIALIZED_FORMAT_SXGM_HOURDEG
-               ? MCC_SERIALIZED_FORMAT_SXGM_HOURDEG_STR
+               ? MCC_SERIALIZED_CP_FORMAT_SXGM_HOURDEG_STR
            : fmt == MccSerializedCoordPairFormat::MCC_SERIALIZED_FORMAT_SXGM_DEGDEG
-               ? MCC_SERIALIZED_FORMAT_SXGM_DEGDEG_STR
-               : MCC_SERIALIZED_FORMAT_DEGREES_STR;
+               ? MCC_SERIALIZED_CP_FORMAT_SXGM_DEGDEG_STR
+               : MCC_SERIALIZED_CP_FORMAT_DEGREES_STR;
 }
 
 template <traits::mcc_input_char_range R>
@@ -48,17 +93,19 @@ static constexpr MccSerializedCoordPairFormat MccSerializedCoordPairFormatStrToV
 
     const auto hash = mcc::utils::FNV1aHash(std::forward<R>(str));
 
-    return hash == mcc::utils::FNV1aHash(MCC_SERIALIZED_FORMAT_DEGREES_STR)
+    return hash == mcc::utils::FNV1aHash(MCC_SERIALIZED_CP_FORMAT_DEGREES_STR)
                ? MccSerializedCoordPairFormat::MCC_SERIALIZED_FORMAT_DEGREES
-           : hash == mcc::utils::FNV1aHash(MCC_SERIALIZED_FORMAT_SXGM_HOURDEG_STR)
+           : hash == mcc::utils::FNV1aHash(MCC_SERIALIZED_CP_FORMAT_SXGM_HOURDEG_STR)
                ? MccSerializedCoordPairFormat::MCC_SERIALIZED_FORMAT_SXGM_HOURDEG
-           : hash == mcc::utils::FNV1aHash(MCC_SERIALIZED_FORMAT_SXGM_DEGDEG_STR)
+           : hash == mcc::utils::FNV1aHash(MCC_SERIALIZED_CP_FORMAT_SXGM_DEGDEG_STR)
                ? MccSerializedCoordPairFormat::MCC_SERIALIZED_FORMAT_SXGM_DEGDEG
                : MccSerializedCoordPairFormat::MCC_SERIALIZED_FORMAT_UNKNOWN;
 }
 
 
-struct MccSerializedCoordPairFormatPrec {
+/*  precision of representation of serialized celestial angle/coordinates pair    */
+
+struct MccSerializedAngleFormatPrec {
     uint8_t hour_prec = 2;  // number of decimal places in hour seconds (sexagesimal format)
     uint8_t deg_prec = 1;   // number of decimal places in arcseconds (sexagesimal format)
     // slightly better than 0.1 arcsecond precision
@@ -120,10 +167,14 @@ concept mcc_serialization_params_c = requires(T t) {
     requires traits::mcc_output_char_range<decltype(t.seq_delim)>;
     requires traits::mcc_output_char_range<decltype(t.elem_delim)>;
 
+    requires std::same_as<decltype(t.angle_format), MccSerializedAngleFormat>;
+    requires std::same_as<decltype(t.angle_prec), MccSerializedAngleFormatPrec>;
     requires std::same_as<decltype(t.coordpair_format), MccSerializedCoordPairFormat>;
-    requires std::same_as<decltype(t.coordpair_prec), MccSerializedCoordPairFormatPrec>;
     requires std::same_as<decltype(t.timepoint_format), MccTimePointFormat>;
 
+    // a format string for mcc_systime_c types (std;:chrono::sys_time)
+    requires std::same_as<decltype(t.systime_format), std::string_view>;
+
     // if true - normalize angle in sexagesimal format (to control rounding)
     // (to avoid something like "24:00:00.0" for sexagesimal 'hours:minutes:seconds' format)
     requires std::convertible_to<decltype(t.norm_sxgm), bool>;
@@ -148,6 +199,12 @@ struct mcc_serializer_interface_t {
         return std::forward<SelfT>(self)(output, value);
     }
 
+    template <std::derived_from<mcc_serializer_interface_t> SelfT, traits::mcc_output_char_range R, typename ValueT>
+    RetT operator()(this SelfT&& self, R& output, ValueT const& value, mcc_serialization_params_c auto const& params)
+    {
+        return std::forward<SelfT>(self)(output, value, params);
+    }
+
 protected:
     mcc_serializer_interface_t() = default;
 };
@@ -159,12 +216,12 @@ concept mcc_serializer_c =
         // static const variable with name of the serializer
         requires std::formattable<decltype(T::serializerName), char> && std::is_const_v<decltype(T::serializerName)>;
 
-        // must define a type "params_t"
-        requires mcc_serialization_params_c<typename T::params_t>;
+        // // must define a type "params_t"
+        // requires mcc_serialization_params_c<typename T::params_t>;
 
-        { t.setParams(std::declval<typename T::params_t const&>()) };
+        // { t.setParams(std::declval<typename T::params_t const&>()) };
 
-        { t_const.getParams() } -> std::same_as<typename T::params_t>;
+        // { t_const.getParams() } -> std::same_as<typename T::params_t>;
     };
 
 
@@ -181,6 +238,12 @@ struct mcc_deserializer_interface_t {
         return std::forward<SelfT>(self)(input, value);
     }
 
+    template <std::derived_from<mcc_deserializer_interface_t> SelfT, traits::mcc_input_char_range R, typename ValueT>
+    RetT operator()(this SelfT&& self, R const& input, ValueT& value, mcc_serialization_params_c auto& params)
+    {
+        return std::forward<SelfT>(self)(input, value, params);
+    }
+
 protected:
     mcc_deserializer_interface_t() = default;
 };
@@ -193,12 +256,12 @@ concept mcc_deserializer_c =
         requires std::formattable<decltype(T::deserializerName), char> &&
                      std::is_const_v<decltype(T::deserializerName)>;
 
-        // must define a type "params_t"
-        requires mcc_serialization_params_c<typename T::params_t>;
+        // // must define a type "params_t"
+        // requires mcc_serialization_params_c<typename T::params_t>;
 
-        { t.setParams(std::declval<typename T::params_t const&>()) };
+        // { t.setParams(std::declval<typename T::params_t const&>()) };
 
-        { t_const.getParams() } -> std::same_as<typename T::params_t>;
+        // { t_const.getParams() } -> std::same_as<typename T::params_t>;
     };
 
 
@@ -213,19 +276,24 @@ struct mcc_serialization_params_t {
     std::string seq_delim{MCC_SERIALIZING_DEFAULT_SEQ_DELIMITER};
     std::string elem_delim{MCC_SERIALIZING_DEFAULT_ELEM_DELIMITER};
 
+    MccSerializedAngleFormat angle_format{MccSerializedAngleFormat::MCC_SERIALIZED_FORMAT_DEGREES};
+
+    MccSerializedAngleFormatPrec angle_prec{MccSerializedAngleFormatPrec{.hour_prec = 2, .deg_prec = 1, .decimals = 6}};
+
     MccSerializedCoordPairFormat coordpair_format{MccSerializedCoordPairFormat::MCC_SERIALIZED_FORMAT_SXGM_HOURDEG};
 
-    MccSerializedCoordPairFormatPrec coordpair_prec{
-        MccSerializedCoordPairFormatPrec{.hour_prec = 2, .deg_prec = 1, .decimals = 6}};
-
     MccTimePointFormat timepoint_format{MccTimePointFormat::MCC_TIMEPOINT_FORMAT_DATE};
 
+    std::string_view systime_format{"{:%FT%T}"};
+
     bool norm_sxgm{false};
 
     bool sxgm_hms{false};
 };
 
 
+static_assert(mcc_serialization_params_c<mcc_serialization_params_t>, "!!!");
+
 namespace details
 {
 
@@ -244,7 +312,7 @@ struct _params_manipulator_t {
             _params.seq_delim = pars.seq_delim;
             _params.elem_delim = pars.elem_delim;
             _params.coordpair_format = pars.coordpair_format;
-            _params.coordpair_prec = pars.coordpair_prec;
+            _params.angle_prec = pars.angle_prec;
             _params.timepoint_format = pars.timepoint_format;
             _params.norm_sxgm = pars.norm_sxgm;
             _params.sxgm_hms = pars.sxgm_hms;
@@ -260,7 +328,7 @@ struct _params_manipulator_t {
         pars.seq_delim = _params.seq_delim;
         pars.elem_delim = _params.elem_delim;
         pars.coordpair_format = _params.coordpair_format;
-        pars.coordpair_prec = _params.coordpair_prec;
+        pars.angle_prec = _params.angle_prec;
         pars.timepoint_format = _params.timepoint_format;
         pars.norm_sxgm = _params.norm_sxgm;
         pars.sxgm_hms = _params.sxgm_hms;
@@ -283,30 +351,40 @@ protected:
 }  // namespace details
 
 
-template <mcc_serialization_params_c ParamsT>
-struct MccSerializerBase : mcc_serializer_interface_t<MccError>, details::_params_manipulator_t<ParamsT> {
-    virtual ~MccSerializerBase() = default;
 
-    using typename mcc_serializer_interface_t<MccError>::error_t;
-
-    using typename details::_params_manipulator_t<ParamsT>::params_t;
-
-protected:
-    MccSerializerBase() = default;
-};
-
-template <mcc_serialization_params_c ParamsT>
-struct MccDeserializerBase : mcc_deserializer_interface_t<MccError>, details::_params_manipulator_t<ParamsT> {
+struct MccDeserializerBase : mcc_deserializer_interface_t<MccError> {
     virtual ~MccDeserializerBase() = default;
 
     using typename mcc_deserializer_interface_t<MccError>::error_t;
 
-    using typename details::_params_manipulator_t<ParamsT>::params_t;
-
 protected:
     MccDeserializerBase() = default;
 };
 
+// template <mcc_serialization_params_c ParamsT>
+// struct MccSerializerBase : mcc_serializer_interface_t<MccError>, details::_params_manipulator_t<ParamsT> {
+//     virtual ~MccSerializerBase() = default;
+
+//     using typename mcc_serializer_interface_t<MccError>::error_t;
+
+//     using typename details::_params_manipulator_t<ParamsT>::params_t;
+
+// protected:
+//     MccSerializerBase() = default;
+// };
+
+// template <mcc_serialization_params_c ParamsT>
+// struct MccDeserializerBase : mcc_deserializer_interface_t<MccError>, details::_params_manipulator_t<ParamsT> {
+//     virtual ~MccDeserializerBase() = default;
+
+//     using typename mcc_deserializer_interface_t<MccError>::error_t;
+
+//     using typename details::_params_manipulator_t<ParamsT>::params_t;
+
+// protected:
+//     MccDeserializerBase() = default;
+// };
+
 }  // namespace impl
 
 }  // namespace mcc
diff --git a/mcc_telemetry.h b/mcc_telemetry.h
index 72491ab..333fcab 100644
--- a/mcc_telemetry.h
+++ b/mcc_telemetry.h
@@ -286,6 +286,14 @@ public:
     }
 
 
+    error_t getTarget(mcc_skypoint_c auto* sp)
+    {
+        sp = _enteredTargetPos;
+
+        return MccTelemetryErrorCode::ERROR_OK;
+    }
+
+
     //
     // blocks the current thread until telemetry data is received.
     // the maximum blocking time is equal to the set timeout (see setTelemetryDataTimeout method)