Bad location by WiFi/BTS

When I am in civilisation (e. g. connected on WiFi) without GPS signal, Android (Google maps) knows my location (with some uncertainity what he can find by networks/BTS around):

But Locus thinks he is on a random place:

Locus loose his position even if I lost/turn-off GPS signal just temporarily. He doesn`t go to the last position but moves to some strange place before he finds GPS even if Android maps knows where I am at least approximately.

This error is there from the start, I just encounter it now more often because using it more frequently.

Regadrs, m