I have a Raytheon RC520 chartplotter runningsoftware v6.05. I had a 112LP seatalk GPS which recently failed and I replaced it with aseatalk 120. With the original configuration I was succesfully using a C-Map NT+ card, but after installing the 120, the chartplotter cannot get past it's boot routine when the NT+ card is installed. If I take the NT+ card out of the chartplotter the plotter comes up and correctly reports gps position. Any ideasthat don't include a $1,000 equipmant upgrade