I haven't got a lot of experience with in car units, but I do know that unless you get a PDA type unit you can't load ozi onto them. 
I have a basic Garmin GPS Map 60 which is fantastic.  However I don't know how good most of the in car units are for anything other than on road driving.  I'm sure one of hte others will be able to give you more detail though.
				
			 
			
		 
			
				
			
			
				1994 Discovery TDi
2004 Discovery 2 TD5
2010 Discovery 4 TDV6
1961, Series 2 Ambulance. 108-098 - Eden 
 
Registry of Ex Military Land Rovers Mem. 129
Defence Transport Heritage Tasmania Member
			
			
		 
	
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