Handy GPS - Australian datums

Handy GPS supports the Australian datums AGD66, AGD84, and GDA94.

The GPS receiver in an iPhone reports locations to the app in WGS84. For the purposes of Handy GPS, GDA94 is considered close enough to WGS84, so no datum shift is performed between these two. (The US datum, NAD83 is a similar story).

For conversion between WGS84 and AGD66 or AGD84, a medium accuracy, 7 parameter datum shift is used. This is accurate to around 1 metre. Please see page 31 of the GDA Technical Manual for further information.

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