I am setting up a Pi4 with
OpenCPN 5.6.2 and Pypilot and using USB
serial ports for
NMEA 0183 data and
GPS on separate
ports of a Zero4U 4-port hub. The
GPS is a Ublox dongle.
NMEA data is from
Seatalk through a Brookhouse multiplexer, powered on a different circuit to the Pi.
If I start the Pi, open OCPN then start the multiplexer all is good.
If I start both together, or close OCPN then reopen, I don't get any data or GPS. However, if I open
Route Manager and activate a
route, data is then available. Data from both ports appears to be available in Minicom at all times.
Is this a quirk of the setup or a problem in settings or
OpenCPN? John.