i have a drone w gps - very small antenna. outdoors lock 3-4+ sat usually takes 1-2 minits.
indoors (tile roof) often takes 5-6 minits
and as jonr says, once it has aquired, i can carry it inside no problem
a friend of mine used to produce and sell those 30-40 years ago.
as i remember he used a pin diode optical sensor to detect a fast rising or falling edge as the bullet went over the traps.
rising light from...
speaking of whisker growth - do your homework before your last cleaning of the board,
some components of some cleansers/solvents that get left behind will actually accelerate
whisker formation and i would also say do...