...

mcc/mcc_generics.h

@@ -626,6 +626,9 @@ static constexpr void mcc_copy_pointing_target_coord(mcc_pointing_target_coord_c
 
 template <typename T>
 concept mcc_telemetry_data_c = mcc_eqt_hrz_coord_c<T> && std::default_initializable<T> && requires(T t) {
+    // user entered target coordinates
+    requires mcc_celestial_point_c<decltype(t.entered_target)>;
+
     // target target coordinates
     requires mcc_pointing_target_coord_c<decltype(t.target)>;