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				Navionics FishnChip SD card
			 
			 
			
		
		
		I have one extra of these. It is the Jan-06 USA-East fish chip from Navionics. I know it works in Lowrance GPS units, but I think it works in other brands as well - check their website.  To get these you have to buy one of their other navigation chips and fill in a rebate card, etc. 
 
If you haven't seen one, the detail is simply amazing.  These are for finding structure.  Its like looking at a topo map for the sea floor, way more detail than the info on the  regular Navionics chips or the chips for Garmin. 
 
$50, I'll cover shipping unless nearby to central CT. 
		
		
		
		
		
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