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		 hey Sandman, 
buy the largest screen with the best viewability and clarity that you can afford.  I purchased all new electronics last year and opted for a smaller GPS to ensure a custom fit in the dash.  I'm looking to add another unit for find a larger unit that will fit. 
 
If you do decide on a laptop, check out panasonics tough book series.  They are liquid resistant and shock proof but I'm not sure how well they'll stand up to a marine enviroment. 
 
Anthony 
		
		
		
		
		
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