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Message: <blockquote data-quote="BramageDained" data-source="post: 687375" data-attributes="member: 7471">Maybe the system only polls the GPS on a given interval.  So right at that point it would correct to GPS position, then run off the sensors on the truck until the next polling period.The system also tries to correct you to be on a road.  There's one spot near me that has an interchange right after an underground tunnel.  Sometimes, if you lane change while in or just past the tunnel, the system will "correct" itself and think you're on a side street that is parallel to the freeway.  If you stay in one lane(even the far right lane) it never happens.The side street is probably 50' from the freeway.If you miss your turn on a non-cloverleaf interchange, it keeps plotting your course like you took the exit for a few seconds.  Then, it figures out you were wrong and recalculates.Since I've never tried/noticed, does the Nav freak out if it goes for a certain amount of time without a GPS signal?  I've not been in the previously mentioned tunnel for more than a couple minutes, SiriusXM will cut out, but, I've not noticed the Nav saying it doesn't have a GPS signal.</blockquote>

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