You'll need some software that will read the Natmap files and plot your position as you move - a lot of people are using Oziexplorer The Official OziExplorer Web Site - GPS Mapping Software for Magellan, Garmin, Lowrance, Eagle, MLR Receivers It's pretty good and easy to set up.
cheers, Andy


 
						
					 
					
					
 
				
				
				
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