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Hope this only replys once, hit the wrong button, etc, etc.
John:
You are missing the point, the dealer should know how to logically approach this.
When you noticed that you are way off course (not where you are supposed to be at all) THAT is the time to check the amount of satellites you are receiving. This is the "Y" in the road. If it's super, say 5 to 10 satellites, then I would proceed with a new nav unit in the MCS (not the MCS itself, the drop-in nav unit. It's all in there except the antenna. If the reception is lousy (3 or less satellites) then I would blame the antenna intermittently bad. If you have something between 3 and 5, then break out the shotgun and try both if it's under warrany anyways.
You can do a synchronization to tell the GPS "exactly" (more or less) where the truck is, if you drive it and it strays alot from where you are (check intersections, bridges, railroad tracks, etc) then the either the nav itself or the antenna is at fault, or maybe wiring. Was the internal version coding changed to reflect that the GPS is there? Could have forgotten I guess.
The truck can change position even if no satellites, so don't let them tell you that because the map moves, everythin g is OK. This is built in, using the wheel speed sensors for when you go through tunnels, around tall buildings, etc where there is no nav reception. It won't be accurate forever though.
Please digest this info carefully so the dealer and I can help you rectify this.
Gilly
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