Gps
Midge,
I would like to help you but am not familiar with your Garmin.
I recently bought a Magellan and the documentation that was included was fairly useless. I went to their web site and found their detailed owner's manual and printed it. It was most helpful and even a digital dummy like me was able to master it.
So, my suggestion is to visit Garmin's site.
By the way, if your GPS is for marine use you have a fairly narrow field of expertise here.
DC
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