diff --git a/cxx/mcc_mount_pz.h b/cxx/mcc_mount_pz.h
index 267a1b0..9236960 100644
--- a/cxx/mcc_mount_pz.h
+++ b/cxx/mcc_mount_pz.h
@@ -130,8 +130,12 @@ template <MccAltLimitKind KIND = MccAltLimitKind::MIN_ALT_LIMIT>
 class MccAltLimitPZ : public MccProhibitedZone
 {
 public:
+    static constexpr MccCoordPairKind preferedCoordKind = MccCoordPairKind::COORDS_KIND_AZALT;
+
     static constexpr MccAltLimitKind altLimitKind = KIND;
 
+    //
+    // TODO: add context (e.g. TT-TAI, UT1-UTC, geo location and so on)!!!
     MccAltLimitPZ(const MccAngle& alt_limit)
         : MccProhibitedZone(KIND == MccAltLimitKind::MIN_ALT_LIMIT   ? "MINALT-ZONE"
                             : KIND == MccAltLimitKind::MAX_ALT_LIMIT ? "MAXALT-ZONE"