Hello PA VR,
You can use the BP_TrackerLocationEngine blueprint component to automatically track and convert your coordinates. Add this component to the actor you want to track in lat/long/altitude coordinates. Initialize the world half-longitude and the maximum altitude corresponding to your UE world coordinates. At the heart of this blueprint is the macro “ToLocationServiceData (from WorldData)” which does the coordinate conversion.
Here’s one suggested operation flow for your problem: 1: decide your map scale (e.g. 1000x500), 2: setup your marker (fixed?)(e.g. with half-longitude = 250 in this example), 3: read your data table info, 4: convert the spawn coordinates from lat/long/alt to xyz (reverse the conversion, see ProcessUpdatedLocation implementation in the BP_PlanarMap for example), 5: spawn actor.
Hope this helps and let me know if you need anything,
Fen