On Mon, 09 Jun 08, gfretwell wrote:
Hard to beat a piece of PVC pipe in shallow water. Drill holes in it
calibrated to the top rail or gunwale so you can use it at night.
One hole 1 ft under the keel, 2 holes 2' below the keel ...

A paddle or an oar works too. And you can mark 'em if you'd like. Or
use the dipstick method: Dip, bring back aboard, stand it on deck and
see how high the wet part is, air dry, repeat ;-)

Rick