Then that should be your 1st plan.
However if that falls through you mentioned either a 5" or a 7". I have no idea of what your budget or income is so what I was trying to point out you may want to go bigger if possible. When you are using a 5" screen split between GPS & sonar that leaves on 2 1/2" per view. If you go with the 7" and spit the screen you'll have 3 1/2" per view (big difference). The larger screen is especially beneficial when using GPS and trying to locate a waypoint.
Honestly what you buy doesn't matter to me, I could care less. The advice I gave you was the same advice given to me a few years back when I upgraded my electronics and after using my units for a few years I'm glad I got the bigger unit.
Just sayin....


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