google maps

Only if your iPad is cellular equipped and you have an active cellular account on it.

Get a mifi device. contact a cellular carrier.

Download map before going about. you will not be able to get driving directions. see:

https://support.google.com/gmm/answer/3273567?hl=en

Or you use your cell phone's personal hotspot option if it supports it. Basically Google Maps requires an internet connection to download the map data as you go along. The internet connection can be wifi or cellular.

Using your cell phones cellular data connection your iPad would then be able to get the map data.