> My altimeter adjusts from 28.1" to 31.0".
> 
> Regards,
> Bob

Thanks for everyone's input.  It seems to me that some form
of differential measurement is necessary.

Ultrasound is interesting but may make deployment of the
instrument more complicated than people are willing to deal
with.  Standard MO right now is to tie a rope or cable to it,
toss it in the water and tie the other end to a large brick,
tree, or post on the riverside.  Anything requiring precise
orientation would likely turn people off.

Mike H.

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