Location-based Switches

I’m trying to make a treasure hunt for my friends, ideally without having to go down the QR route and put physical items out (partly because I don’t trust people to leave them but also I’m lazy).
The GPS option is what I’m looking at, but I want the challenge to be to find the location, rather than guiding them to a location then having them answer a question/do a thing there.
The Switches function suggests I should be able to hide the element until they’re within a certain distance of a GPS point, but when I’ve done a test run with the Switch turned on for the test Element, it just insta-completes the Bound without any input.
Am I trying something that’s not possible or have I potentially set it up wrong?

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