NavList:

After all of this enlightening conversation about using a GPS to determine HoE, I thought, "Gee Whiz", there has to be a better way".

There IS!

Technidea Zip Level Pro2000 is MANOMETER. It bases its differential height measurement based upon hydrostatic pressure. The base and mobile unit can be up to 200 feet (60 meters) apart, and the claimed accuracy is 0.1". They state that this is for +/- 20 feet (6 meters), but that the unit can be leapfrogged to essentially any distance and vertical height. I assume that the 'carry' or leapfrog has a 0.1"/leap accuracy, so for practical marine navigation HoE, the accuracy would be less than 1" (160 feet HoE / 20 feet vertical range * 0.1" accuracy = 0.8"). This would be a over a distance of 1600 feet (486 meters).

Its a single person measurement.

http://www.ziplevel.com/

Its not cheap at about US$900, but we may not need this accuracy. There may be other manometers that meet our purposes that aren't this expensive.

I now know what my next toy will be!!!!!

Brad Morris

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