This coins you can use for land survey app Apglos Survey Wizard. Apglos Survey Wizard is easy-to-use. Anyone can be a land surveyor now with this surveying software.
You can download the app for free from the Google Play Store.
This GPS survey app works with coins. Every functions costs some amount of coins. The exact amount of coins per function you can find here.
This is an advantage. Because you only pay for the functions you use.
After you register for Apglos Survey Wizard you get 2500 coins for free. This is for testing purposes. When you are out of those coins then you can buy new coins here.
In this case you get a coupon for 52500 coins.