ok, that's not really a valid test as such, the GPS only needs power to do what it does, it will pull a signal very quickly without the camera nearby but when you add the camera it's a hot start anyway which should be instant, if you power off while you're connecting it's a warm start after a few seconds which will also be close to instant, the camera as a cause of interference will far outweigh any interference from the cable that connects the two, someone asked in another thread why we use external GPS, situations like this is one of the reasons, having the GPS internal or very near to the camera as in a bracket mount is a lot more involved than people (some manufacturers included) appreciate