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Don’t know how relevant it might be to your particular experience, but I do know that GPS tracking products where the receiver is installed outside the vehicle tend to produce far fewer nav problems than when positioned inside the car or truck. There are a number of things inside a vehicle that can interfere — often in insidious ways — with signal accuracy leaving the device in “best guess” mode. Materials (particularly metallic elements) found in some windshields, for example, can produce idiopathic errors depending on the angle of line of sight through the windshield. Blue tooth, WiFi hotspots, radios and other amenities commonly found in modern cars can confuse signal processing.
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