Reply
 
Thread Tools Search this Thread
 
Old 11 July 2002, 10:25   #1
pjm
Member
 
Country: UK - England
Town: Reading
Make: Ribeye
Length: 4.5
Engine: 40 HP 4stroke
Join Date: Jun 2002
Posts: 8
fish finder / sonar

I am thinking of getting some sort of depth gauge for my rib (just for fun). I was surprised that most of the fish finder type only show the depth directly below the boat. Is this much use???

I then found some ads for forward scanning sonar that shows the depth for something like 150M infront of the boat. This sounds more promissing.

I would be interested to hear peoples views on this.
__________________

__________________
pjm is offline   Reply With Quote
Old 12 July 2002, 08:53   #2
Member
 
Country: Ireland
Town: Loch Lurgain
Boat name: an t-easnach
Make: Gemini
Length: 5m +
Engine: Honda 50
Join Date: Oct 2000
Posts: 138
well i think the depth sounder is a great yoke. avoiding running aground is the main advantage and you can alarm for shallows and then take it easy keeping a sharp lookout (lookdown?) ahead. of course, looking forward is an advantage but more costly methinks. as for finding fish, erm well, lets say dont believe every fish than swims on ur fishfinder!
__________________

__________________
gaelforce is offline   Reply With Quote
Old 13 July 2002, 13:56   #3
Member
 
Country: UK - England
Town: Great Harwood, Lancs
Boat name: Tigger II
Make: Bombardier Aerodeck
Length: 3m +
Engine: Tohatsu 25HP
Join Date: Jul 2001
Posts: 626
Hi there

Never had a forward looking sonar on a RIB but have a yacht.

It was the echo pilot silver.

Had little sucess with it was great in deper water but seamed to get confused when running in shallow water.Also the depth shown in not the depth under keel but a average of the depth so far in front of you.

On paper they look great. Maybe I had fitted the previous one wrong, wrong place etc. They look ideal for RIBS but need I need convincing to fit another to my new RIB especially at 800 quid !!.

Has anyone else had then and had good results ?.

Regards Gary
__________________
Garygee is offline   Reply With Quote
Old 15 July 2002, 16:21   #4
Member
 
Richard B's Avatar
 
Country: UK - England
Town: Devon
Boat name: White Ice
Make: Ranieri
Length: 5m +
Engine: Suzuki 115hp
Join Date: Jul 2002
Posts: 5,015
I'm not the best informed person on this, but have been told that depth sounders on RIBs aren't particularly popular, as they don't work at all when the boat's on the plane. This was confirmed by my experience of a charter RIB which had a sounder fitted - it worked very well at displacement speed (which is a sensible sort of speed to be doing when you're concerned about the depth!) but not at all when on the plane. I would fit an ordinary sounder to a RIB as I've got a peculiar aversion to running aground, but guess that the expense on a fancy forward looking one wouldn't be particularly worthwhile.
__________________
Richard B is offline   Reply With Quote
Old 16 July 2002, 05:03   #5
Member
 
Country: Canada
Town: Newfoundland
Length: no boat
Join Date: May 2000
Posts: 2,097
Depth sounders or fish finders on RIBS can work whilst on the plane if the transducer (which is usually transom mounted) is installed so that it will still be in the water when the boat is planing. Often times they aren't and if not airborne are in aereated water and hence give no reading. That being said, a transom mounted sensor is reading the depth at the stern of the boat - i.e. what you have just gone over. If you are doing 35kts by the time your shallow alarm has gone off you will know the water is shallow by the sound of your outboard/drive leg & prop hitting the bottom!!

A depth sounder of some sort it essential kit however. The economics of them seem to make it cheaper to fit a fish finder (even if you are never going to fish or wreck find) than a pure numerical sounder. I also find it quite useful to have a graphical picture of what the seabed is doing.

No experience with forward looking ones but know they are expensive whereas a cheap fishfinder is 150 or so.

HTH, Alan
__________________
Alan is offline   Reply With Quote
Old 16 July 2002, 12:55   #6
pjm
Member
 
Country: UK - England
Town: Reading
Make: Ribeye
Length: 4.5
Engine: 40 HP 4stroke
Join Date: Jun 2002
Posts: 8
Thanks

Thank you all for your comments.

It looks like a cheap fish finder is the best option for a rib.
__________________
pjm is offline   Reply With Quote
Old 16 July 2002, 14:55   #7
Member
 
Country: UK - Scotland
Town: Highlands
Boat name: Quicksilver
Make: Quicksilver
Length: 3m +
Engine: Mariner 15hp
Join Date: Aug 2001
Posts: 1,771
Hi there

There has been MUCH debate on this subject in RibNet, see previous postings (try a search on the subject).

It appears from the extensive research I have done (on the net etc.) that most fishfinders only work at slower speeds, due to the effect of planing and water disturbance. But, as I suppose they are FISH finders, they are actualy designed for fishermen milling about and looking for FISH, so we shouldn't be surprised!

I hope to get mine later in the year (remember to my BOSS it's a SONAR), and I want (need ) it for the fun (necessity ) of just finding out what is under the boat.

I do remember though that there was a hand-held sonar (looked like a torch) that you could use in front of the boat.

Keith (still waiting for it) Hart
__________________
Small boat - BIG truck

www.photo4x4.co.uk
Keith Hart is offline   Reply With Quote
Old 16 July 2002, 15:19   #8
Member
 
Country: UK - Wales
Town: Aberystwyth
Boat name: Undecided
Make: Undecided
Length: Undecided
Engine: Undecided
Join Date: Apr 2002
Posts: 605
Or you could do what somebody on our boat handling course did, keep going until you see a bloke in waders fishing infront of you, but for some reason he didn't realise that that meants "shallow water" and kept going. Luckily I wasn't on the same boat, and it wasnt a RIB either, nor did it have any instrument to find depth. The RIB I was in however did, kinda useful with it being a dive boat and all...
__________________
narked is offline   Reply With Quote
Old 16 July 2002, 16:38   #9
Member
 
Country: UK - England
Town: Great Harwood, Lancs
Boat name: Tigger II
Make: Bombardier Aerodeck
Length: 3m +
Engine: Tohatsu 25HP
Join Date: Jul 2001
Posts: 626
On the issue of transom mount transducers, has anyone any info on how through hull transducers perform on RIB's.
At least they will be under the water

That is assuming you can get to the hull to fit one .


Gary
__________________
Garygee is offline   Reply With Quote
Old 16 July 2002, 19:44   #10
Member
 
Country: Denmark
Town: Copenhagen
Boat name: Nemesis
Make: CAPE 79
Length: 8m +
Engine: Suzuki 250 4 stroke
Join Date: Dec 2001
Posts: 252
Send a message via AIM to Rene Send a message via MSN to Rene
transom / through hull transducers

Hi

I just couldn't stop my self replying to this thread.

I have both a transom and a through hull transducer on my RIB.

The through hull transducer is connected to my eagle fishfinder
and the transom mounted to my Furuno Color fishfinder.

I don't know much about the through hull transducer, since it put inside the hull on production. It could also be the big diference in the fishfinder. But the transom one is the best.

I can have a nice steady picture of the sea floor with my transom mounted transducer and the Furuno, going up to 38 Knots, without any disorder (except when the boat is completly out of the water).

The main thing here i the position of the transducer. Mine is on the right hand side (star board) of the engine about 30 centimeters from the engine. The buttom of the transducers if about 5 mm below the rib hull, making some of the water go behind the transducer and up the transom, but keeping the transducer in the water at all times.

I havn't tried the forward looking ones, but would like to get more info on this subject. Also if anyone have had any experience with the ones thats looking out to both sides of the both. Could be great for Wreck finding when diving.

Rene
__________________

__________________
Rene is offline   Reply With Quote
Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off





Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -5. The time now is 19:48.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.