There have only been a few leap days in geocaching history. Find a question mark that without any doubt belongs to the first of these occasions. Having identified its location, multiply that cache by 2207.505 and divide the result by the length of a leap year february (in days). This will give you a distance (in meters). Dividing the cache by 3765.461 will give you the angle needed for the big leap that gets you to the stash. Take the WGS 84 reference ellipsoid and be sure to calculate with sufficient precision! E.g. using the popular tool found on 'zwanziger.de' you will end up roughly 22 km from the correct location.
Still in doubt? Check it out:
±3m
Happy Hunting,
theluckyteam