It is suggested that each location you choose is given a unique number. Photographing the location with the number will help to keep track of where the images were taken.
Your photos are only of value if you can record the exact location the photo was taken. With most photos you also need to record the direction in which the photo was taken. You can design your own method to fix locations, but the method must allow someone other than yourself in 10 or more years time to go back and take repeat photos.
Requires a camera, tripod and bushwalking GPS or a dedicated camera GPS, notepad and pencil; or, instead of a tripod, a pole which can hold a series of numbers on top which can be changed.
Requires a camera, tripod, notepad and pencil, small star stickers, compass, pole which can hold a series of numbers on top which can be changed, and detailed maps.