You can record your location on different parts of your property or town. For area I use the north east corner as a1 and the south west as as Z26. This could be 1 foot/letter or number.
If you have a 5 room house you could call them zone 1 through 5 and then use A1 through M10 if they were all 10x10 feet. So zone 3 E5 could be the middle of room 3. You can use whatever system you like and it will record the location of your phone and the discription you select. This could also locate your plants.