Reflowered Graticule
As the Great Game ages, it might be a fun incentive to exploration to have a formal reward for geohashing in a graticule that has been inactive for a long time.
I therefore propose the Reflowered Graticule achievement, earned by reaching a hashpoint ten years or more after the most recent successful expedition in that graticule. This is different from the Virgin Graticule achievement, which of course goes to the first person EVER to reach the hashpoint in a graticule.
ExcellentGeohasher earned the Reflowered Graticule achievement
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If multiple expeditions reach the same qualifying hashpoint, they all qualify for the Reflowered Graticule achievement, regardless of who got there first.
If one or more people have claimed the Reflowered Graticule achievement, and it later comes to light that there actually HAD been an intervening successful expedition in that graticule, then that's pretty funny and they can deal with it as they see fit.
As with the Virgin Graticule achievement, winning the Reflowered Graticule award is a good opportunity to update and improve the page for the reawakened graticule.