Found your graticule only to discover it's mostly water? Your geohashed point is underwater and you can't swim? CoastSeeker will give you the closest point on the coastline to the original geohashed point.

This does not check if the point is underwater, you should already know if your point is in underwater. This script will give you the closest coast point regardless of whether you're on land or water.

An alternate use of this form is to use your graticule as a base and put you and your significant other's birthdays after the decimal, and go to the beach-point closest (regardless of whether it's over the water or not. However this won't work if your graticule has no coast).