I purchased a Navman iCN 750.  It worked for a while. Then it lost track of its maps.   Navman's tech support people appeared not to care.  They promised to call back, never did.  Promised a manager would call back.  Never did.  Sent me emails of how...

The Navman ICN 750 came out a few years ago with a huge price tag of $699.00. With a 4 inch screen and a 4 gig hard disk which included pre loaded maps, $699.00 was still a steep price to pay compared to the other manufacturers like Tom Tom and Garmin....

I brought this sat nav system as it advertised speed camera warnings on the box. What it did not say was that you will have to pay a yearly subscription for this service. However, it is very easy to use straight from the box and the back on track...