Invisible wrote:
> ...so the incidence of crossing lines depends on how much shipping is in 
> the area?

It was something like that, yes. I had the impression he meant the tracks 
that the boat was actually on were showing up. Sonar off the boat hull and 
the wake of the boat taking sonar readings.

It's also a matter of how much the boat actually measures. You get really 
good resolution directly under the boat, less to the sides, so you have to 
interpolate.

> (And these features aren't part of the actual seabed...)

That's the lowdown, yes.

-- 
   Darren New, San Diego CA, USA (PST)
   I ordered stamps from Zazzle that read "Place Stamp Here".

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