Reply
 
Thread Tools Search this Thread
 
Old 28 April 2004, 08:01   #1
Member
 
Country: Ireland
Town: Carigaline/Baltimore
Boat name: XS-600
Make: XS-Ribs
Length: 6m +
Engine: Merc Optimax 150 XL
Join Date: Feb 2004
Posts: 682
Compasses?

Went to my local chandlers today to buy a compass for my new rib. They stocked three different types.

Danforth Skipper 2 Global Balance
Plastimo Offshore 75/90
Silva 70

Has anybody got any experience using any of these models. Which is the best for use on a 6m Rib? Any reccomendations or advice? It will be mounted off to the right, to allow for GPS mounting on the flat horizontal surface in the pic.
Attached Thumbnails
Click image for larger version

Name:	Console.jpg
Views:	395
Size:	47.6 KB
ID:	5382  
__________________

__________________
Steve G
If In Doubt, Go Flat Out!!
swginn is offline   Reply With Quote
Old 28 April 2004, 08:13   #2
Member
 
Country: UK - England
Town: Nutbourne
Boat name: Renegade
Make: Porter
Length: 6m +
Engine: 140 Tohatsu
MMSI: 235022904
Join Date: Dec 2003
Posts: 1,195
Just fitted a Ritchie B-51 bracket mount. Good clear 120mm card, back lit, well damped and can be adjusted up to 30º to alow for all the cabling, metal & RF around a console. Available with black, white or blue card.
£47.99 from Aladins Cave.
__________________

__________________
Mark H
"A common mistake that people make when trying to design something completely foolproof is to underestimate the ingenuity of complete fools" Douglas Adams
Mark Halliday is offline   Reply With Quote
Old 28 April 2004, 08:14   #3
Member
 
Country: Canada
Town: Newfoundland
Length: no boat
Join Date: May 2000
Posts: 2,097
Gonna stick my neck out here and say none of 'em & you should get a digital one with a handbearing compass (e.g. Plastimo Iris) as ultimate backup. Proper compasses in my experience are damn near useless in a RIB at speed and in a chop. Steering a course to +-20 degrees is the norm. A digital one such as KVH azimuth or 'praps one of the tacktick solar powered ones gives a much easer to read and use display. I know its another piece of electrikery to go wrong hence the thought of the solar powered tacktick (costs about £180). In real extremis e.g. if all your electrics go wrong, the GPS satellites go down etc etc you can get your hand bearing compass out and use to navigate even if you have to do it slowly or stop every so often for position fix and new course to steer.

Of the three you have mentioned I've only used the Plastimo 75 which seemed as good as any.

Cheers,
Alan
__________________
Alan is offline   Reply With Quote
Old 28 April 2004, 09:22   #4
Member
 
Country: UK - England
Town: Margate / Ramsgate
Boat name: Ballistic
Make: Ballistic
Length: 7m +
Engine: Yam HPDI 250
Join Date: Feb 2002
Posts: 2,835
I'm inclined to agree with Alan... i realy regret selling my KVH with grayswish. I do feel a 'budget' fixed compass is good enough, because it will be just as useful as a 'good' one. I've fitted a small £30 one to my rib... it allows me to tell which way i am pointing and that is about all.
__________________
Daniel is offline   Reply With Quote
Old 28 April 2004, 09:42   #5
Member
 
Country: Ireland
Town: Carigaline/Baltimore
Boat name: XS-600
Make: XS-Ribs
Length: 6m +
Engine: Merc Optimax 150 XL
Join Date: Feb 2004
Posts: 682
I suppose I should have said that the main reason that I'm buying a compass is as a backup for my GPS which will be my primary navigation aid and so don't really want anything electrical. At the end of the day there's not much that can go wrong with a conventional compass.

Alan, did the plastimo 75 have adjustment to allow for electrical interference (GPS, VHF, Sonar).

By how much (degrees) does electrical interference generally affect a compass?
__________________
Steve G
If In Doubt, Go Flat Out!!
swginn is offline   Reply With Quote
Old 28 April 2004, 09:58   #6
Member
 
Country: UK - England
Town: Kent
Boat name: Cygnet
Make: Humber
Length: 5m +
Engine: Suzuki 70hp 4* outbo
Join Date: Apr 2004
Posts: 205
Don’t under estimate to power of a conventional compass.
We were diving off the Mulberries in Pagham bay one weekend in fog, we had no problem getting there & back to Bognor using the GPS on the first trip. We managed to get back out again on the second trip using the GPS with no problem, it was when we went to come back the GPS wouldn’t initialise it couldn’t find any satellites. We later found out they switched them off for re-calibration, so we had to use the old clockwork compass. As land came into sight we were only 100yds away from the slipway.
__________________
Jackwabbit is offline   Reply With Quote
Old 28 April 2004, 10:35   #7
Member
 
Country: Canada
Town: Newfoundland
Length: no boat
Join Date: May 2000
Posts: 2,097
Quote:
Originally Posted by swginn
I suppose I should have said that the main reason that I'm buying a compass is as a backup for my GPS which will be my primary navigation aid and so don't really want anything electrical. At the end of the day there's not much that can go wrong with a conventional compass.

Alan, did the plastimo 75 have adjustment to allow for electrical interference (GPS, VHF, Sonar).

By how much (degrees) does electrical interference generally affect a compass?
Well yes and no. I'd assumed that you wanted the compass for backup. Whilst there is not much that can go wrong with the compass itself you are right that you need to compensate for effect of electronics and swing it to understand deviation on particular headings. If you read the installation manuals for compasses and electronics they say that they should be some distance apart. Can't recall exactly how much but generally more room than is available on a RIB console. Especially a small one like yours.

The thing that attracts me with the tacktick kit is that it is completely self contained and self powered. 200hr battery life with solar charging. So it is an independent back up system.

and no I dont sell em its just what I would fit on a new RIB myself!

check out http://www.tacktick.com/products/vie...ct.asp?prod=29
__________________
Alan is offline   Reply With Quote
Old 28 April 2004, 10:42   #8
Member
 
Country: UK - England
Town: Portsmouth
Make: Tornado
Length: 6m +
Engine: Yamaha HPDI 200
Join Date: Jan 2003
Posts: 323
Send a message via MSN to thorper
Hi - this is the setup we've got on our Tornado (comes from Barnet marine like your rib), using a plastimo compass. It works well, and is pretty useable even if the boat is moving around a lot.

Ricky
Attached Thumbnails
Click image for larger version

Name:	C28_jpg.jpg
Views:	334
Size:	48.8 KB
ID:	5383  
__________________
thorper is offline   Reply With Quote
Old 28 April 2004, 11:01   #9
Member
 
Country: Ireland
Town: Carigaline/Baltimore
Boat name: XS-600
Make: XS-Ribs
Length: 6m +
Engine: Merc Optimax 150 XL
Join Date: Feb 2004
Posts: 682
Thanks very much for the input all. Alan while I value your experience and opinion, I prefer the conventional glass ball approach. It just comes down to personal preference. I can see the advantages of the Tacktick system, but would prefer to see North South East & West instead of digital numbers. If they made a model with a more traditional North South East West display I would definitely consider it. Not sure if this makes sense, but I just like the glass ball compass.

Thorper, what model is that?
__________________
Steve G
If In Doubt, Go Flat Out!!
swginn is offline   Reply With Quote
Old 28 April 2004, 11:21   #10
Member
 
Country: UK - England
Town: nr Lymington
Boat name: JU-JU
Make: Halmatic PAC22
Length: 6m +
Engine: 140.5 Mermaid
Join Date: Sep 2003
Posts: 1,400
A word of caution, the conventional compasses are badly effected by electronics and lumps of metal and the effect might not be same throughout its range (sometime a few degrees off, sometimes more). With the previous boat I owned keying the fist mike would swing the compass 20 deg. To get the compass set properly is a comparatively expensive operation involving a compass swinger (that least that is what he called himself) and driving around in circles for what seemed like hours.

I think Tacktick is a good option or Autohelm who used to make a fluxgate compass with a conventional display. Alternatively an Iris 50 handheld £40 (more in euros) and worth every penny (cent) but remember to stand up when you are using it.
__________________

__________________
Scary Des 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 22:36.


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