I have tried to install IGO 2006 on Sprint 700wx a while back.. And I couldn't even have it installed. I managed to put a copy of MIO map, which is supposedly similar, at least using same map, as IGO. And I got the same behavior you see with MIO actually.
I haven't tried lately 'cause I sorta gave up on IGO since i'm pretty happy with Tomtom, but I've read some where the 2007 version of IGO fairs better on 700wx. Give it a try if you insist on using IGO.
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