@MicTieMix:
for a routed phone
POI in ov2 file format
/data/data/com.tomtom.gplay.navapp.nds/files/state/personal/pois/abc.ov2
POI icon in PNG file format 60x60 max. 64x64
/data/data/com.tomtom.gplay.navapp.nds/files/state/personal/pois/ov2_icons/hdpi/abc.png
Your POI will be shown in My Places.
I haven't tried installing on an sd card, but I believe that folders would be available then.
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