Have a (aviation) business need to constantly determined distances between points on a map. Unfortunately the iPad does not seem to have this feature transferring into the iPad map program. Any solutions ? In actuality, even Google Earth is a compromise so would love to hear of any nice Apps that allow me to use an existing map or nautical/aeronautical (or even a roadmap or Geopolitical map) to determine distances - and maybe even some other nice features as well. Thanks . . .