Okay, so the Premium Hunt Membership app from onX Hunt hasn't saved my life, but it has saved me hours of research and gas money. I use this app for metal detecting. It allows me to find owners of properties that I have researched to find old homesteads that are more than likely plowed fields now. I simply tap on the desired property, and doing to gives me the property owner's address. Then I go knock on their door to ask permission to use my metal detector on their property. Most of the people I talk with are very interested in what I do, so getting permissions to metal detect properties is part of what makes the hobby fun. The onX app also allows me to track my grid and allows me to drop pins for points of interest.