Using the formula we were given in some engineering class I come up with line of sight being 3.5 miles if your antenna is 6' above the sea.
I always thought it was more like 5-8 miles.
What really got me was that we've had to get in touch with SeaTow/USCG from 40ish miles out and had no trouble talking to either of them. I reckon they have better/taller equipment.
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Ryan 
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