The satellites drift a bit, so from one month to the next, you can 'move' 20 feet....
If you have a known starting point - one of your corners? And you have a good view of the whole sky to get a lot of satellites then you can work from there with it and get within 10 feet, likely within a foot.
The high tech units that cost a bundle use some point on land (RTK from a tower) and so they always know where that fixed point is, and where the satellites place you, and can get within an inch or less. You sort of emulate this if you are dead certain of one point, and you can work fast enough that the satelte drift doesn't move you too much.
Mine has a feature of adding better sensitivity, uses a bit more battery power, to do the 3 foot accuracy, vs a 10 foot accuracy.
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