SPOT Assist - Classic SeaCraft Community

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SPOT Assist

02-17-2010, 12:40 PM

Fr. Frank

Senior Member

Join Date: Oct 2003

Location: Shalimar, Florida

Posts: 2,265

Re: SPOT Assist

Quote:

naval.com is not even close to Chapman's calculations.
6 ft antenna on either end produced a 6 mile range according to navel.com.

Am I doing something wrong???

This made me think. SO I went to "How Stuff Works" to find the following formula:
SquareRoot(height above surface / 0.5736) = distance to horizon.

That works out to about 1 mile for every 8 inches in height. So a 6' antenna (72 inches) has a line of sight of 9 miles.

I wonder if the current Chapman's still has the old guideline? My copy is from the late 1970's.

__________________
Common Sense is learning from your mistakes. Wisdom is learning from the other guy's mistakes.

Fr. Frank says:
Jesus liked fishing, too. He even walked on water to get to the boat!

Currently without a SeaCraft

(2) Pompano 12' fishing kayaks
'73 Cobia 18' prototype "Casting Skiff", 70hp Mercury

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