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Old 12 December 2011, 13:28   #11
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Originally Posted by GaryC View Post
Are we saying here that the iphone never remembers is rough position (old position) and has to do the long update each time you power it on. (When out of range of the cell network)

That is my understanding - I don't have an iPhone to test it with, but I believe the same issue applies to some/all smartphones. And its not everytime you turn the phone on/off but every time you turn the gps feature on/off. If you have cell towers or wifi signal in range then you won't notice it (in fact it should be quicker than a normal gps in the same circumstances) but in the middle of nowhere it take a long time.
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Old 13 December 2011, 08:07   #12
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Yep, I got a secondhand Garmin V last used on the south coast. Took nearly 10 mins to initially work out where it was, then another 5 or 6 for a half decent "WAAS dump" for proper accuracy. Usually takes 2-3 mins now if I have for example switched off at Port Edgar & on at Largs. If same location it's usually sub 1 min. That's with 15YO technology.

The garmin instructions suggest you to do a "black start" if you have moved more than about 500 miles. This involves you telling it roughly where you are so it can start looking for the right set of satellites.

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