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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.

Glenn Wark
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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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  • Thanks. Couldn't find that anywhere five years ago though. – Glenn Wark Jul 13 '18 at 15:02
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    I 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.

http://social.msdn.microsoft.com/Forums/sqlserver/en-US/664214bb-abbc-4d14-91db-1ccfeb239371/importance-of-choosing-srid

Glenn Wark
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