I bought a stock H3 navi unit off of eBay about 2 weeks ago (got a good deal on the unit, disc, and gps antenna) and at times the navigation unit tends to "wonder" it shows my rig going out to the middle of nowhere instead of being on the road where I actually am and I have to recalibrate the system... Does anyone know what would cause this? I'm thinking that I need to set the speeds up a little higher but I'm not sure...

 

I just traded my 06 Lexus IS350 for my 07 H3 2 weeks ago. My Lex started to to do the same "wondering" , I had to recalibrate it. I know its a different car, but youshould be able torecalibrate with no problem.

 

you may have issue with VSS wire or location of Your GPS antenna