I have been trying for several days to get my Garmin 178C GPS to connect to my Simrad IS15 Combi and wind instruments. I have followed up with Garmin to insure I am sending on com port 1 and have set the Simrad IS15 Combi to recieve but I think there is a data recognition problem between the 2 devices. Is there some setting on the Garmin I can change to assist the communication with the 2 devices?? Anyone out there who can assist. Would greatly appreciate any advice/help. Thanks David