IF you drive into a tunnel and lose the sats, when you drive out of the tunnel you hook up quite quickly because those 3 sats have not moved out of range yet. That "boot search" takes several minutes, all dependent on sat signal strength and quality of the receiver. You may never see that happen, but it happens all the time. As those sats move out of range, another sat in the constellation "arrives" and the system switches to it. So the system then seeks the 3-4 strongest signals and then uses them to navigate with. ( Our Sync GPS units are always "on", and are tracking the sats all the time.) When you power up, it seeks those satellites.and they may be on the other side of the planet. When you turn off your GPS (like a Garmin), the system records the ID of the satellites it was using. The satellites are in orbit, and in constant motion. The time it takes the GPS system to "hook up" is directly related to the amount of time it was out of comms with the satellite array. Curious.what do you mean by "leaving WiFi on"? Click to expand.WiFi and GPS have no relationship.
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