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Just reading filemaker help here:accuracy - any numeric expression or field containing a number that represents a distance in meters.Lower down, I find:LocationValues fetches the location values until the requested accuracy is met or until timeout. If you cancel the process, FileMaker Go returns the most accurate location in the cache (if any). If no location is received, FileMaker Go returns an empty string.So if you specify an accuracy of "1" you want a location with an accuracy of +/- 1 meter. The function will repeatedly try to get a location with that accuracy or better, halting when it succeeds or when the timeout (in seconds) specified has elapsed.since the accuracy is given in meters, I'd expect the altitude to also be in meters, but the help article doesn't specify. Seems like this would be pretty easy to test by getting the altitude at a location where you already know what value is correct.