NavList:

Hello Bruce, you wrote:
"I considered the same problem recently on a bluff (high dune) on Cape Cod."

Yeah, that's just the sort of situation where this would be most likely to be useful, assuming we've got some means of projecting a rock horizontally far enough to reach the water (either a good throwing arm or a slingshot of some sort). Also it might be of use on a large cruise ship. I liked Gary's idea of dangling a small bottle over the side on a string until the line goes slack and then pulling it up and measuring the length, but I can imagine circumstances where that might annoy the neighbors.

And you wrote:
"or dip is about 4 * free-fall seconds"

Glad to see we're in agreement on that. :)

-FER
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