If your model allows input of long/lat then you can us it that way but you won't be able to easily mark a fishing area or structure as you pass over it. You would have to stop over it and get the Long/Lat numbers and input them that way.
I think for me doing it the way you described by input would be to aggravating. There are new and used ones out there for little of no $.
That's just my way of thinking for me.
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