How do I use my iPhone GPS location for iPad Pro?

Consider the functional differences between WiFi Only and WiFi+Cellular models of iPad...

Aside from the obvious Cellular functionality, only WiFi+Cellular models have built-in GNSS/GPS location capabilities - which may impact any Apps or features that require or use accurate and consistent location data - such as geotagging a photo's EXIF metadata. 

WiFi Only models of iPad have no Cellular capabilities - and as GNSS/GPS functionality is derived from the Cellular chipset, a WiFi Only iPad lacks the means by which to generate accurate location data. However, it is possible to add GNSS/GPS positioning capabilities to a WiFi Only iPad by using a dedicated GPS receiver - such as BadElf or Garmin GLO.

By contrast, an iPhone does have built-in GNSS/GPS positioning capabilities - and can therefore use this data for geotagging photos taken with the iPhone's camera. Be aware that when usung a mobile phone’s hotspot to provide a cellular network connection for a tethered device (such as an iPad) the phone does not share GPS information derived from its own positioning capabilities.

AlWeir,

If the iPad had cellular hardware for a cellular connection, it would also have GPS hardware. (The two features are bundled.)

oviking99,

I don't think there is a way to use the iPhone GPS data for the iPad.

When you take photos on an iPhone, the iPhone tags them with location information. Presumably an iPad that has the cellular data hardware (and thus a GPS receiver) does the same.

However, that's not the same as tagging the photos from another camera using location information from the iPad.

If your iPad has a Cellular connection it would probably work since you need the towers to triangulate you location.