[PSUBS-MAILIST] Forward scanners

[Alan via Personal_Submersibles]

Hank,
most fish finders I've looked at come with dual beam functions like 20 degrees & 60 degrees.
The 20 degrees is for deeper water & not so accurate in closer; but you don't
want to see minnows, just rocks & tree stumps:). Perhaps the 20 degree beam would work?
What sort of problems did you have? How did the set up work best.
Alan

Sent from my iPad

> On 8/10/2014, at 11:19 pm, hank pronk via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
> 
> 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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