I have a Garmin 546s and use to have a Garmin 400c . The 546s dropped right in using the older 400c sounder. If I mount the 400c in the front of the boat can I piggyback it off of the sounder that’s already on the boat. Or do I have to use 2 sounders, one on each unit? If I have to have both, how far away do they have to be?
July 2, 2011 at 11:17 pm
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