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The Norfolk Broads Forum / Geeks Korner / Depth sounder
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Posted By Discussion Topic: Depth sounder

Similar Threads That Might Help :
Shallow water depth sounders?| NASA Marine Combined Depth Sounder & Speed Log| New Depth Sounder| Depth Sounder for sale| Depth Sounder| river depths|

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ChrisHGB
Aug-25-2016 @ 5:43 AM                           Permalink
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Nasa Instruments are pretty good and not expensive. You say "While the boat is out" I would not go through the hull if you are GRP. All the manufacturers do an in hull transponder kit.

Chris.

I have swallowed the anchor but
have not tried mud weight yet!

LeoMagill
Aug-25-2016 @ 7:08 AM                           Permalink
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As Chris says use in hull for grp, you just bond a tube inside and fill with oil, pop in the transponder and it 'sees' through the grp, the nasa duet system is good and gives a speed log as well but that will have to go through the hull.

If you don't like what I say don't hurl abuse at the boat, I've sold it...

essexboy
Aug-25-2016 @ 7:31 AM                           Permalink
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After fitting you need to set the gauge to read either the "depth below keel" or the  " depth below sounder" I use below keel ,but I know others who use the other, so you pays your money and take your choice.

George Sims

rustic
Aug-25-2016 @ 7:51 AM                           Permalink
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I use a lowrance fish finder, with a transom mount, the risk here is, if you leave it in the water, it can be crushed by ice in the winter.
No offset, so you need to know how deep the tranducer is.
Another issue, it can get fouled with algal growth which affects it, and at certain speeds turbulance and bubbles can make it read 169 feet on Barton broad lol...

Well I think it's an error lol.


best regards, Richard.

Can't wait to be back on our boat on
the Broads.

ChrisHGB
Aug-25-2016 @ 8:39 AM                           Permalink
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I saw one in an outdoor activity and canoe shop like you describe, I think it was a Garmin so a good make.
But like Rustic says, when mounted on a normal transom you will get bubbles and turbulance. I think they are really designed for fishing at trolling speeds under one of those very small electric motors.

Chris.

I have swallowed the anchor but
have not tried mud weight yet!

Speleologist
Aug-25-2016 @ 8:50 AM                           Permalink
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quote:"......
After fitting you need to set the gauge to read either the "depth below keel" or the  " depth below sounder"
......."

Any good one can also be adjusted the other way, to show depth of water. This is the setting I always choose for the following reason:

If, particularly in soft mud, I get to a point where the boat is touching the bottom, with depth set to below the keel it will read 0. It will never show a negative figure. If I get further in to the soft mud it will still read 0. If, however, I set it to depth of water and I go in to soft mud, it will still show the depth, even if my keel is in the mud, so I can see whether I an getting out of the mud (depth increasing) or driving myself further in (depth decreasing).

For the same reason, if you do choose depth below keel, it is a good idea not to allow a safety margin. It gets to read zero and you're still afloat. It gives you no idea whether things are getting better or worse until you are back into deeper water than the safety margin.

I spend a lot of time on different sailing school yachts and I always calibrate the depth gauge before sailing (using a lead line) and set it to depth of water.

Robin
www.robin.me.uk
"Posthabui tamen illorum mea seria ludo"

Mercator
Aug-25-2016 @ 8:58 AM                           Permalink
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'Morning, Chris.

As with others I have found the NASA Clipper system to be very good. You may still be able to bond the transducer internally, but it depends on the thickness and type of wood used for the hull. Failing that, maybe bracket mounted on the transom as you mentioned - so long as there's not too much turbulence at the waterline etc.

Try giving NASA Marine a call on 01438 221023 - I've always found them helpful with guidance and advice on their products.

Hope the above helps.

Steve.


Steve & Maggie.


Not quite an ancient mariner ..... though some say he was at sea before Pontius was a pilate !

rustic
Aug-25-2016 @ 9:47 AM                           Permalink
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My transducer is on a long thin bracket, fixed to the transom above the waterline, with a wing nut, so for risk of ice, swing it above the waterline out of the way, or remove it all together, better than fitting the transom mount screws below the waterline.
You may need to do a temporary fix to find the best place at most speeds.

best regards, Richard.

Can't wait to be back on our boat on
the Broads.


This message was edited by rustic on Aug-25-16 @ 10:47 AM

LeoMagill
Aug-25-2016 @ 4:26 PM                           Permalink
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Why has this been moved to geeks corner?
I'd have thought boat owners q&a would have been more appropriate.
A depth sounder on a boat isn't realy geeky is it?

If you don't like what I say don't hurl abuse at the boat, I've sold it...

rustic
Aug-25-2016 @ 5:06 PM                           Permalink
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I recon it's Geeky, if you have one, and the mods don't lol...


best regards, Richard.

Can't wait to be back on our boat on
the Broads.

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