Our dearest apologies if you lost your Home Base bonus due to GPS drift. COIN has a way to help prevent this from happening next time around.
Tap Auto Explore when you first enter the area of your Home Base.
Please note that Auto Explore must be initiated inside of the Home Base in order to suppress any Geomines that happen outside of the Home Base square and prevent losing your Home Base Bonus.
Once your Home Base is created, tap the Home Base icon on the left side of the app. Make sure you enable the "Prevent Home Base Bonus Reset" as well.
If you created your Home Base with the Auto Explore feature on, you will need to turn Auto Explore off and on once more when your Home Base feature is established.
If your Home Base is already established, you will need to turn Auto Explore off and on upon entering in order to prevent the loss of your bonus.
If you want to leave your Home Base and Geomine elsewhere, just turn off Auto Explore and turn it back on when you are outside of your Home base.