Thanx a 1,000,000 for taking the time to help me.
Oops, my bad! I had also been playing with a Heltec 32 WiFi kit, and forgot to change the board (how embarrassing).
I am still indoors, so will either need to use a battery or, perhaps, sit by the window to test GPS.
At the moment, after a few seconds the software reports "Brownout detector was triggered" over serial, then reboots. I will investigate that & ask a new question if I can't solve it. Sorry to have taken your time.
