If your iPad has cellular you can also turn off the Location service in settings, if you're not using it. The GPS can cause quite a drain if it's being used in the background by some app you did not expect.
Less drastic, go through all the enable apps and turn off those you suspect may be using the GPS.
Hold in mind that if you use features like the location based reminders in the Reminders app, your GPS will be turning on fairly often to check where you are. For that reason I rarely set up those reminders, and never if it's going to be more than a few hours before I want the be reminded. The one time I set up a reminder several days ahead I noticed a big difference in my battery drain.
You can generally tell if the GPS is being used by the arrow head icon next to the battery indicator.