Originally Posted by
peterh337
But there is no way, in the Ipad2, to select which GPS to use.
It uses any external device in preference to the internal one.
I have so far only tried it with Memory Map and it appears that if the external GPS dies, the app just quietly stops working, or quietly switches over to the built-in GPS - with its reliability issues.
There is an API provided by Dual which allows an application to see the full satellite constellation, DoP and battery charge level. It may be worth 'feeding back' to Memory Map that this would be a good idea.
The other thing I noticed that when the GPS battery goes flat, the MM app just sits there, showing the last position. No message, no warning...
MM really should alert on loss of GPS reception. It is far too subtle at the moment.