onX support says it would not be guaranteed, it is not the same as a GPS equipped cellular iPad.
Internet data would be passed, but no guarantee that the GPS data would be passed.

I asked if an external GPS unit connected to the iPad would work...

 

Wow,

onX support is really good.

I will try an external unit with my iPad Pro and report back...

"While we do not have any external GPS devices to test at our office,
we have heard of some success with this option. We can't guarantee compatibility, but
in theory if the device displays location information on your iPad across all apps,
it should work to show location information in our App products as well. We would
recommend reaching out to the manufacturer for those external GPS devices to check
about their compatibility with Apps to ensure it is something that would work for
what you are trying to use it for."

 

So, the mods figured this is a hunting related post?

onX has many different outdoor apps.

Shrug...

 

why not just use your smartphone? all i ever did,,clear concise fast and money...

 

I could use the smartphone, though, I really like the size of iPad Pro screen.