Hi Luis,
Been for a short sailing trip:-)
I ordered a new board and could reprogram it (the old one was not visible via the usb). Now everything seems to be ok.
I think the esp32 is corrupt and with te same code I have a new one working again (?)
See photo for my nmea4wifi
Thanks,
Ben

ok, I will try. For what its worth, the piggyboard red led is lit when 12 volt is supplied via the 'normal' connection. Earlier I tried to reprogram this esp-wroom32 board via my pc and usb cable. no success. Again, connected with the usb-cable then it is red and blue and wifi works. First things fi...

Sure, i have a multimeter:-)
Model TH

After months in winter sleep the nmea4wifi will not connect anymore. When connect directly over usb then I see the wifi on my Ipad. Tried the over the air upgrade to the latest 5.x and this went well.
Even in this version the nmea4wifi is not emitting any wifi signal…any tips ?.
Thx in advance,
Ben