Brand new user, if this question has been answered before, please direct me to that answer. Recently took a trip to Seattle from Utah. Nav system routed me through Yakima, but I elected to use a different route. Nav system never 'recalculated' as I expected from using other GPS systems, just kept trying to turn me around an go back to where I deviated. Had to stop, turn Nav off and back on for map to change. Is this normal for this system? (Not OnStar turn by turn) Any help out there?