diff --git a/mcc_ccte_erfa.h b/mcc_ccte_erfa.h
index 4d18fd0..30f71bd 100644
--- a/mcc_ccte_erfa.h
+++ b/mcc_ccte_erfa.h
@@ -280,15 +280,15 @@ public:
     }
 
 
-    // latitude and longitude
-    template <mcc_angle_c LAT_T, mcc_angle_c LON_T>
-    void geoPosition(std::pair<LAT_T, LON_T>* coords) const
+    // longitude and latitude
+    template <mcc_angle_c LON_T, mcc_angle_c LAT_T>
+    void geoPosition(std::pair<LON_T, LAT_T>* coords) const
     {
         std::lock_guard lock{*_stateMutex};
 
         if (coords) {
-            coords->first = _currentState.lat;
-            coords->second = _currentState.lon;
+            coords->first = _currentState.lon;
+            coords->second = _currentState.lat;
         }
     }
 
diff --git a/mcc_concepts.h b/mcc_concepts.h
index 7156946..8c97eaa 100644
--- a/mcc_concepts.h
+++ b/mcc_concepts.h
@@ -473,11 +473,11 @@ struct mcc_skypoint_interface_t {
         return std::forward<SelfT>(self).refractInverseCorrection(dZ);
     }
 
-    // returns apparent sideral time (Greenwich) for the epoch of the celestial point
+    // returns apparent sideral time (Greenwich or local) for the epoch of the celestial point
     template <std::derived_from<mcc_skypoint_interface_t> SelfT>
-    auto appSideralTime(this SelfT&& self, mcc_angle_c auto* st)
+    auto appSideralTime(this SelfT&& self, mcc_angle_c auto* st, bool is_local)
     {
-        return std::forward<SelfT>(self).appSideralTime(st);
+        return std::forward<SelfT>(self).appSideralTime(st, is_local);
     }
 
     // returns equation of origins for the epoch of the celestial point
@@ -571,7 +571,7 @@ concept mcc_pcm_c = std::derived_from<T, mcc_pcm_interface_t<typename T::error_t
 //         static constexpr uint16_t HW_MOVE_ERROR = 555;
 //     }
 template <typename T>
-concept mcc_hardware_movement_state_c = requires {
+concept mcc_hardware_movement_state_c = std::formattable<T, char> && requires {
     []() {
         // // mount axes were stopped
         // [[maybe_unused]] static constexpr auto v0 = T::HW_MOVE_STOPPED;
@@ -621,7 +621,6 @@ concept mcc_hardware_movement_state_c = requires {
 template <typename T>
 concept mcc_hardware_state_c = requires(T state) {
     // encoder co-longitude and co-latiitude positions, as well as its measurement time point
-    // the given constrains on coordinate pair kind can be used to deduce mount type
     requires mcc_coord_pair_c<decltype(state.XY)> &&
                  (decltype(state.XY)::pairKind == impl::MccCoordPairKind::COORDS_KIND_GENERIC ||
                   decltype(state.XY)::pairKind == impl::MccCoordPairKind::COORDS_KIND_XY);
diff --git a/mcc_coordinate.h b/mcc_coordinate.h
index 3378235..7fcd44d 100644
--- a/mcc_coordinate.h
+++ b/mcc_coordinate.h
@@ -475,7 +475,7 @@ public:
             std::pair<double, double> pos;
             cctEngine.geoPosition(&pos);
 
-            return MccGeoLONLAT(pos.second, pos.first);
+            return MccGeoLONLAT(pos.first, pos.second);
         }
 
 
@@ -581,10 +581,9 @@ public:
     }
 
 
-    error_t appSideralTime(mcc_angle_c auto* st) const
+    error_t appSideralTime(mcc_angle_c auto* st, bool is_local = false) const
     {
-        // return Greenwich apparent sideral time since epoch is UTC
-        return cctEngine.apparentSideralTime(_epoch, st, false);
+        return cctEngine.apparentSideralTime(_epoch, st, is_local);
     }
 
 
@@ -735,6 +734,16 @@ protected:
         static_assert(PT::pairKind != MccCoordPairKind::COORDS_KIND_UNKNOWN, "UNSUPPORTED SKY POINT TRANSFORMATION!");
 
 
+        if constexpr (PT::pairKind == MccCoordPairKind::COORDS_KIND_LONLAT) {  // returns geographic site coordinates
+            std::pair<double, double> pos;
+            cctEngine.geoPosition(&pos);
+
+            cpair.setX(pos.first);
+            cpair.setY(pos.second);
+
+            return error_t{};
+        }
+
         if (_pairKind == MccCoordPairKind::COORDS_KIND_RADEC_ICRS &&
             PT::pairKind == MccCoordPairKind::COORDS_KIND_RADEC_ICRS) {  // from ICRS to ICRS - just copy and exit
             cpair = PT(typename PT::x_t(_x), typename PT::y_t(_y));
diff --git a/mcc_ser.h b/mcc_ser.h
index 1f71a63..a381d4e 100644
--- a/mcc_ser.h
+++ b/mcc_ser.h
@@ -158,8 +158,10 @@ 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)
+    template <typename ParamsT = mcc_serialization_params_t>
+    error_t operator()(traits::mcc_output_char_range auto& output,
+                       VT const& value,
+                       ParamsT const& params = mcc_serialization_params_t{})
     {
         if constexpr (std::formattable<VT, char>) {
         } else if constexpr (std::convertible_to<VT, std::string>) {
@@ -205,8 +207,10 @@ struct MccSerializer<VT> : MccSerializerBase {
 
     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)
+    template <typename ParamsT = mcc_serialization_params_t>
+    error_t operator()(traits::mcc_output_char_range auto& output,
+                       VT const& value,
+                       ParamsT const& params = mcc_serialization_params_t{})
     {
         std::vformat_to(std::back_inserter(output), params.systime_format, std::make_format_args(value));
 
@@ -220,8 +224,10 @@ template <typename 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)
+    template <typename ParamsT = mcc_serialization_params_t>
+    error_t operator()(traits::mcc_output_char_range auto& output,
+                       VT const& value,
+                       ParamsT const& params = mcc_serialization_params_t{})
     {
         double v = (double)value;  // radians (see mcc_angle_c concept)
         std::string sgm;
@@ -264,8 +270,10 @@ 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)
+    template <typename ParamsT = mcc_serialization_params_t>
+    error_t operator()(traits::mcc_output_char_range auto& output,
+                       VT const& value,
+                       ParamsT const& params = mcc_serialization_params_t{})
     {
         double jd;
 
@@ -304,11 +312,12 @@ 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)
+    template <typename ParamsT = mcc_serialization_params_t>
+    error_t operator()(traits::mcc_output_char_range auto& output,
+                       VT const& value,
+                       ParamsT const& params = mcc_serialization_params_t{})
     {
-        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;
+        auto pars = params;
 
         pars.norm_sxgm = true;
         pars.coordpair_format = MccSerializedCoordPairFormat::MCC_SERIALIZED_FORMAT_SXGM_HOURDEG;
@@ -358,8 +367,10 @@ 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)
+    template <typename ParamsT = mcc_serialization_params_t>
+    error_t operator()(traits::mcc_output_char_range auto& output,
+                       VT const& value,
+                       ParamsT const& params = mcc_serialization_params_t{})
     {
         auto serialize_cpair = [&]<typename T>(T& cp) {
             auto ccte_err = value.to(cp);
@@ -423,52 +434,256 @@ 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)
+    template <typename ParamsT = mcc_serialization_params_t>
+    error_t operator()(traits::mcc_output_char_range auto& output,
+                       VT const& value,
+                       ParamsT const& params = mcc_serialization_params_t{})
     {
         // 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
+        // REFR_CORR_MOUNT, ENC_X, ENC_Y, PCM_X, PCM_Y, RA_APP_TAG, DEC_APP_TAG, AZ_TAG, ZD_TAG, LAST, EO, TIMEPOINT,
+        // STATUS
 
         // 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;
+        auto pars_h = params;
 
-        pars.norm_sxgm = true;
-        pars.coordpair_format = MccSerializedCoordPairFormat::MCC_SERIALIZED_FORMAT_SXGM_HOURDEG;
+        auto pars_d = params;
 
-        std::string ra_obs, ra_app, ha, last, ra_app_tg;
-        MccSkyRADEC_OBS r_obs;
-        MccSkyRADEC_APP r_app;
+
+        pars_h.norm_sxgm = true;
+        pars_h.coordpair_format = MccSerializedCoordPairFormat::MCC_SERIALIZED_FORMAT_SXGM_HOURDEG;
+        pars_d.norm_sxgm = true;
+        pars_d.coordpair_format = MccSerializedCoordPairFormat::MCC_SERIALIZED_FORMAT_SXGM_HOURDEG;
+
+        MccSkyRADEC_OBS rd_obs;
+        MccSkyRADEC_APP rd_app;
+        MccSkyHADEC_APP hd_app;
+        MccSkyAZZD azzd;
 
         // quantities in hour representation
-        MccSerializerBase::angleFormatFromCoordPairType<VT::pairKind, MccSerializerBase::CO_LON>(pars);
+        MccSerializerBase::angleFormatFromCoordPairType<VT::pairKind, MccSerializerBase::CO_LON>(pars_h);
+
+        // quantities in degree representation
+        MccSerializerBase::angleFormatFromCoordPairType<VT::pairKind, MccSerializerBase::CO_LON>(pars_d);
 
         MccSerializer<MccAngle> ang_sr;
 
-        // RA_OBS_MOUNT
-        auto ccte_err = value.mountPos.toAtSameEpoch(r_obs);
+        // RA_OBS_MOUNT, DEC_OBS_MOUNT
+        auto ccte_err = value.mountPos.toAtSameEpoch(rd_obs);
         if (ccte_err) {
             return mcc_deduced_err(ccte_err, MccSerializerErrorCode::ERROR_COORD_TRANSFORM);
         }
 
-        auto err = ang_sr(ra_obs, r_obs, pars);
+        auto err = ang_sr(output, rd_obs.x(), pars_h);
         if (err) {
             return mcc_deduced_err(err, MccSerializerErrorCode::ERROR_UNDERLYING_SERIALIZER);
         }
 
-        // RA_APP_MOUNT
-        ccte_err = value.mountPos.toAtSameEpoch(r_app);
+        MccSerializerBase::addElemDelimiter(output, pars_h);
+
+        err = ang_sr(output, rd_obs.y(), pars_h);
+        if (err) {
+            return mcc_deduced_err(err, MccSerializerErrorCode::ERROR_UNDERLYING_SERIALIZER);
+        }
+
+        MccSerializerBase::addElemDelimiter(output, pars_h);
+
+        // RA_APP_MOUNT, DEC_APP_MOUNT
+        ccte_err = value.mountPos.toAtSameEpoch(rd_app);
         if (ccte_err) {
             return mcc_deduced_err(ccte_err, MccSerializerErrorCode::ERROR_COORD_TRANSFORM);
         }
 
-        err = ang_sr(ra_app, r_app, pars);
+        err = ang_sr(output, rd_app.x(), pars_h);
         if (err) {
             return mcc_deduced_err(err, MccSerializerErrorCode::ERROR_UNDERLYING_SERIALIZER);
         }
+
+        MccSerializerBase::addElemDelimiter(output, pars_h);
+
+        err = ang_sr(output, rd_app.y(), pars_d);
+        if (err) {
+            return mcc_deduced_err(err, MccSerializerErrorCode::ERROR_UNDERLYING_SERIALIZER);
+        }
+
+        MccSerializerBase::addElemDelimiter(output, pars_h);
+
+        // HA_APP_MOUNT
+        ccte_err = value.mountPos.toAtSameEpoch(hd_app);
+        if (ccte_err) {
+            return mcc_deduced_err(ccte_err, MccSerializerErrorCode::ERROR_COORD_TRANSFORM);
+        }
+
+        err = ang_sr(output, hd_app.x(), pars_h);
+        if (err) {
+            return mcc_deduced_err(err, MccSerializerErrorCode::ERROR_UNDERLYING_SERIALIZER);
+        }
+
+
+        MccSerializerBase::addElemDelimiter(output, pars_h);
+
+        // AZ_MOUNT, ZD_MOUNT
+        ccte_err = value.mountPos.toAtSameEpoch(azzd);
+        if (ccte_err) {
+            return mcc_deduced_err(ccte_err, MccSerializerErrorCode::ERROR_COORD_TRANSFORM);
+        }
+
+        err = ang_sr(output, azzd.x(), pars_d);
+        if (err) {
+            return mcc_deduced_err(err, MccSerializerErrorCode::ERROR_UNDERLYING_SERIALIZER);
+        }
+
+        MccSerializerBase::addElemDelimiter(output, pars_h);
+
+        err = ang_sr(output, azzd.y(), pars_d);
+        if (err) {
+            return mcc_deduced_err(err, MccSerializerErrorCode::ERROR_UNDERLYING_SERIALIZER);
+        }
+
+        MccSerializerBase::addElemDelimiter(output, pars_h);
+
+        // refraction correction
+
+        MccAngle ang;
+        ccte_err = value.mountPos.refractCorrection(&ang);
+        if (ccte_err) {
+            return mcc_deduced_err(ccte_err, MccSerializerErrorCode::ERROR_COORD_TRANSFORM);
+        }
+
+        err = ang_sr(output, ang, pars_d);
+        if (err) {
+            return mcc_deduced_err(err, MccSerializerErrorCode::ERROR_UNDERLYING_SERIALIZER);
+        }
+
+        MccSerializerBase::addElemDelimiter(output, pars_h);
+
+
+        // encoder X and Y
+
+        err = ang_sr(output, value.hwState.XY.x(), pars_d);
+        if (err) {
+            return mcc_deduced_err(err, MccSerializerErrorCode::ERROR_UNDERLYING_SERIALIZER);
+        }
+
+        MccSerializerBase::addElemDelimiter(output, pars_h);
+
+        err = ang_sr(output, value.hwState.XY.y(), pars_d);
+        if (err) {
+            return mcc_deduced_err(err, MccSerializerErrorCode::ERROR_UNDERLYING_SERIALIZER);
+        }
+
+        MccSerializerBase::addElemDelimiter(output, pars_h);
+
+
+        // PCM X and Y
+
+        err = ang_sr(output, value.pcmCorrection.pcmX(), pars_d);
+        if (err) {
+            return mcc_deduced_err(err, MccSerializerErrorCode::ERROR_UNDERLYING_SERIALIZER);
+        }
+
+        MccSerializerBase::addElemDelimiter(output, pars_h);
+
+        err = ang_sr(output, value.pcmCorrection.pcmY(), pars_d);
+        if (err) {
+            return mcc_deduced_err(err, MccSerializerErrorCode::ERROR_UNDERLYING_SERIALIZER);
+        }
+
+        MccSerializerBase::addElemDelimiter(output, pars_h);
+
+
+        // RA_APP_TAG, DEC_APP_TAG
+        ccte_err = value.targetPos.toAtSameEpoch(rd_app);
+        if (ccte_err) {
+            return mcc_deduced_err(ccte_err, MccSerializerErrorCode::ERROR_COORD_TRANSFORM);
+        }
+
+        err = ang_sr(output, rd_app.x(), pars_h);
+        if (err) {
+            return mcc_deduced_err(err, MccSerializerErrorCode::ERROR_UNDERLYING_SERIALIZER);
+        }
+
+        MccSerializerBase::addElemDelimiter(output, pars_h);
+
+        err = ang_sr(output, rd_app.y(), pars_d);
+        if (err) {
+            return mcc_deduced_err(err, MccSerializerErrorCode::ERROR_UNDERLYING_SERIALIZER);
+        }
+
+        MccSerializerBase::addElemDelimiter(output, pars_h);
+
+        // AZ_TAG, ZD_TAG
+        ccte_err = value.targetPos.toAtSameEpoch(azzd);
+        if (ccte_err) {
+            return mcc_deduced_err(ccte_err, MccSerializerErrorCode::ERROR_COORD_TRANSFORM);
+        }
+
+        err = ang_sr(output, azzd.x(), pars_d);
+        if (err) {
+            return mcc_deduced_err(err, MccSerializerErrorCode::ERROR_UNDERLYING_SERIALIZER);
+        }
+
+        MccSerializerBase::addElemDelimiter(output, pars_h);
+
+        err = ang_sr(output, azzd.y(), pars_d);
+        if (err) {
+            return mcc_deduced_err(err, MccSerializerErrorCode::ERROR_UNDERLYING_SERIALIZER);
+        }
+
+        MccSerializerBase::addElemDelimiter(output, pars_h);
+
+
+        // LAST, local apparent sideral time
+
+        ccte_err = value.mountPos.appSideralTime(&ang, true);
+        if (ccte_err) {
+            return mcc_deduced_err(ccte_err, MccSerializerErrorCode::ERROR_COORD_TRANSFORM);
+        }
+
+        err = ang_sr(output, ang, pars_h);
+        if (err) {
+            return mcc_deduced_err(err, MccSerializerErrorCode::ERROR_UNDERLYING_SERIALIZER);
+        }
+
+        MccSerializerBase::addElemDelimiter(output, pars_h);
+
+
+        // EO, equation of origins
+
+        ccte_err = value.mountPos.EO(&ang);
+        if (ccte_err) {
+            return mcc_deduced_err(ccte_err, MccSerializerErrorCode::ERROR_COORD_TRANSFORM);
+        }
+
+        err = ang_sr(output, ang, pars_h);
+        if (err) {
+            return mcc_deduced_err(err, MccSerializerErrorCode::ERROR_UNDERLYING_SERIALIZER);
+        }
+
+        MccSerializerBase::addElemDelimiter(output, pars_h);
+
+        // coordinates epoch
+
+        auto ep_err = MccSerializer<MccCelestialCoordEpoch>{}(output, value.mountPos.epoch(), pars_d);
+        if (ep_err) {
+            return mcc_deduced_err(err, MccSerializerErrorCode::ERROR_UNDERLYING_SERIALIZER);
+        }
+
+        MccSerializerBase::addElemDelimiter(output, pars_h);
+
+
+        // status (it must be formattable, see mcc_concepts.h)
+
+        auto st_err =
+            MccSerializer<decltype(value.hwState.movementState)>{}(output, value.hwState.movementState, pars_d);
+        if (st_err) {
+            return mcc_deduced_err(err, MccSerializerErrorCode::ERROR_UNDERLYING_SERIALIZER);
+        }
+
+
+        return MccSerializerErrorCode::ERROR_OK;
     }
 };
 
diff --git a/mcc_serialization_common.h b/mcc_serialization_common.h
index bed1243..334a254 100644
--- a/mcc_serialization_common.h
+++ b/mcc_serialization_common.h
@@ -163,7 +163,7 @@ static constexpr std::string_view MCC_SERIALIZING_DEFAULT_ELEM_DELIMITER{","};
 
 
 template <typename T>
-concept mcc_serialization_params_c = requires(T t) {
+concept mcc_serialization_params_c = std::copyable<T> && requires(T t) {
     requires traits::mcc_output_char_range<decltype(t.seq_delim)>;
     requires traits::mcc_output_char_range<decltype(t.elem_delim)>;