Thomas,
I found the solution from a French Forum, Anyway, thank you very much for your help. I will remember you and tell about your great forum. I learned à lot
The solution was: gtkterm to change the configuration of ttyS0, it was on 9600 baud, and in the "help" from
openCPN to put the gps on
NMEA mode.
6 days (several hours per days) of
research, and one white night !!!
And it works now
Thank you again
Yannick