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1) some one takes them
2) some one fishes your 'honey hole'
3) some one runs them over w/ boat
If you want to semi-permanently mark a spot, maybe a milk jug w/ a brick etc would be a better option.
Go ahead and mark the spot you have found in your GPS if you have them.
If you don't have a GPS-use a notepad to take notes. Choose a landmark close to the spot and make your notes- Like 100 yards off the big rock-also note the water level as it can change.
By the way-Bass Pro has very reasonable hand held GPS units that come in handy!!