[PSUBS-MAILIST] Forward scanners

[hank pronk via Personal_Submersibles]

Alan,
It would be nice to have some kind of forward obstruction avoidance, I think the fish finder scanning beam may be to wide.  We played around with that, with no luck.  
Hank

 
--------------------------------------------
On Wed, 10/8/14, Alan James via Personal_Submersibles <personal_submersibles at psubs.org> wrote:

 Subject: [PSUBS-MAILIST] Forward scanners
 To: "psubs.org" <personal_submersibles at psubs.org>
 Received: Wednesday, October 8, 2014, 5:55 AM
 
 Has anyone
 had any experience or know anything about forward
 scanners.I'm
 reading.....Without
 moving parts, the ForwardScan transducer is more akin to a
 conventional sounder that has been tipped on its side. Its
 effective range is about eight times the actual depth, up to
 about 160 feet ahead of the boat. It includes a built-in
 shallow depth alarm with parameters set by the user. In deep
 water, this is great for detecting rocks and pinnacles. Of
 course, if you are operating in shallow waters such as the
 Bahamas or portions of the Chesapeake the eight-to-one ratio
 begins to work against you.This seems
 to indicate that if you are cruising 5ft off the bottom or
 closer in a submarine, you won't get much warning for
 collision avoidance from the alarm settings These would just
 pick up on the bottom 5ft below rather than an obstruction
 coming off the bottom in the distance. Can these be mounted
 so the angle of the beam runs parralel to the sea bed,
 pointing more up than down? Or do I leave as is & forget
 about the alarm function. Am I just as well off buying a
 fish finder & mounting that forward
 facing? Regards
 Alan.
 
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