[PSUBS-MAILIST] Forward scanners

[Alan via Personal_Submersibles]

Thanks Alec,
I had a look at the Interfase scout, & they make comment that .....
" The unit is not designed to provide forward "bottom" image, but will provide a bottom chart mode directly under the boat. Some limitations are observed in very shallow ranges."
That's a bit of a warning that 2 of you haven't had much success.
Just had a a look at a guy experimenting with a fish finder for forward sonar on a ROV.
He was really having trouble interpreting what was happening with the on screen
representation of a bucket moving toward the transducer in his swimming pool.
( there are other nuts out there)
Alan


   

Sent from my iPad

> On 9/10/2014, at 12:00 am, Alec Smyth via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
> 
> Hi Alan,
> 
> I made multiple attempts to use an Interphase Vista, which sounds a lot like what you're describing, but was never able to make anything of what I saw on the display and ended ecup getting rid of it. Technically I suppose it worked, but I could not interpret the images. I know far better ones are available now, but if what you're looking at is an Interphase, I would suggest it might be worth while going for the next step up price-wise.
> 
> Best,
> 
> Alec
> 
>> On Wed, Oct 8, 2014 at 5:55 AM, Alan James via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
>> 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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