Thank you for the tip. The built in unit does a few things that the tablet won't, such as sonar/ fish finder. The sonar is real important when fishing. another issue with my boat is the hard top. An external antenna is needed for an uninterrupted satellite signal.
I have the app on my phone as a backup just in case the built in unit fails. Some nights headed out to the island late and dark, the GPS is a nice second look at your position!
Dan
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