Geert Maene wrote:
I have a garmin gps 12 that is connected to a raymarine interface and
then to a com port on the PC. Last year everything worked perfect. This
year the green LED in the interface (NMEA-led) stops and start when he
wants.
I cleaned all contacts, checked all the wires, stopped the PC and the
DSC radio, but nothing helps.
I called a technician. He said something about the minus (-) is
connected to the ??? in the pc. I needed a special device to solve that.

Has anybody more info about that error??

There would be two wires from the GPS with data, they would be white and
brown and are called Data In (white) and Data Out (brown). Maybe he is
saying that one of those two wires is being shorted (intermittently?) to
the black ground wire.

Sometimes the ground wire on a GPS receiver's RS-232 serial connector
needs to be grounded to the same ground as the device that it is
connected to. If that is the case here, temporarily grounding the black
wire in the serial cable to the PC and/or DSC radio might test that
theory.

Jack