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Some of the Garmin units come with a wire that hooks into your car that allows for "dead reckoning" by watching your speed and braking pattern, so it can keep u
by Andys 18y ago
Some of the Garmin units come with a wire that hooks into your car that allows for "dead reckoning" by watching your speed and braking pattern, so it can keep up with you when you're going through an area with no reception.
- chiffonade 18y agoMy in-dash unit does this. It works great for tunnels and parking garages.