@Vlad-Nirky
thanks for the tip, I have SatStat running since half an hour now on the phone, alas it don't find me any latitude nor longitude. Displays lots of small red bars and says Satellites 0/30, from the few I understand it's not very good :-). Either I missed something in the config options, or the problem with FP5 Gps is too basic for SatStat to solve.
Running Waydroid for the first time on the UT phone is a bit disturbing experience but diving into that would be off-topic here.