The app will send the latitude and longitude to the server. It looks like it is probably NAD83 or WGS84 and I'm confused by some of the stuff I've been reading.
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what does the "Android" tag have to do with Apple Maps? – Michael Dautermann Jul 09 '13 at 23:16
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Apologies, I've removed the Android tag. I added the tag before finalizing my question. – Glenn Wark Jul 09 '13 at 23:25
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After some more reading, it looks like it is WGS84. – Glenn Wark Jul 09 '13 at 23:43
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It's in the documentation! Apple's CoreLocation uses WSG84.
https://developer.apple.com/documentation/corelocation/cllocationcoordinate2d

Gregor
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1I believe that. I've been looking for this info periodically for years and could only find speculation until very recently. They must have just (finally) added it to the docs. – Gregor Jul 15 '18 at 22:38
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This post seems to confirm that all GPS companies use WGS84. Apple uses TOMTOM data.

Glenn Wark
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