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Arthur-
 <(sea/air temps at sea level near the
vessel only capture part of the picture).>
 True. Bear in mind that general local and seasonal sea temperatures can often 
be applied, without actually measuring them. I can be fairly certain the "my" 
local waters will range near 70 in August but hard under 40 in February, and 
within a +-5F range in any given month.
 Also, the internet allows us to cheat by looking at actual deep sea bouy 
data, so I can say for certain that a certain station off Maine was at 34F 
yesterday, while another in Maryland was at 42F, and my local Ambrose Tower 
apparently has been moved inland, it no longer displays any sea temperature 
at that location. (At least, I hope it was moved to dry land, the alternative 
is that sea level has dropped some hundred feet while I was sleeping.)

 Of course, ignoring it all and simply allowing a 5-6 minute circle of 
position is still the simplest way to do it, but "simple" isn't always part 
of CN.

   

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