I have a Garmin C330 and I have noticed that it estimates arrival times based on using a speed 5-6 mph over the actual speed limit for the road. I don't know of a way to adjust this. Has anybody else noticed this? Do other GPS brands allow you to adjust the way arrival times are calculated?
I do not believe there is a way to change the calculation for arrival time. The unit, of course, keeps updating arrival time from your current location so that it is accurate upon arrival. Quite frankly, it has been fairly accurate for me when there isn't traffic or a lot of red lights.
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