To the best of my knowledge there is no way to do this directly.
Things that you can try.
If you have an iPad with 3G and GPS, make sure you've got a good lock on your location. Open the Map app and make sure it can find you.
If you have a Wifi only iPad, go into Settings, General, Location services and turn them off. Most apps will at least stop asking you at that point. Apps that need to know where you are to work properly, as opposed to serving you localized ads, should have an option to set you location. The method will vary.