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 bulkhead compass accuracy		  New Topic  Topic Locked
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dasreboot
Admiral

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803 Posts
Initially Posted - 11/03/2016 :  04:45:29  Show Profile  Visit dasreboot's Homepage
Is the aft bulkhead of the cabin square to the fore and aft line of the boat? I was going to install a bulkhead compass and realized that I had no way to measure this.
Todd Lewis
Eowyn 87 TR/WK C25 #5656
ARWEN 84 TR/SK C25 #4031
www.mainsailsailingschool.com

Stinkpotter
Master Marine Consultant

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Djibouti
9013 Posts
Response Posted - 11/03/2016 :  06:35:21  Show Profile
I'd say close enough, but it matters not--you can adjust the compass after it's installed--it probably includes the tool. Do you also have a hand-bearing compass? If so, you stand in the center of the cockpit and point it at the bow.
Dave Bristle
Association "Port Captain" for Mystic/Stonington CT
PO of 1985 C-25 SR/FK #5032 Passage, USCG "sixpack" (expired),
Now on Eastern 27 $+!nkp*+ Sarge
Edited by - Stinkpotter on 11/03/2016 06:36:23
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dasreboot
Admiral

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803 Posts
Response Posted - 11/03/2016 :  07:35:50  Show Profile  Visit dasreboot's Homepage
what using the deviation magnets?
Todd Lewis
Eowyn 87 TR/WK C25 #5656
ARWEN 84 TR/SK C25 #4031
www.mainsailsailingschool.com
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Steve Milby
Past Commodore

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USA
5851 Posts
Response Posted - 11/03/2016 :  08:58:08  Show Profile
Maybe I'm missing something, but why does it matter? It will point north regardless of whether it is mounted or held in the hand and turned back and forth. If you want to steer on a heading 30 deg east of N, it will tell you when you are on that heading, regardless of whether the compass is mounted exactly square to the fore and aft line of the boat.

Nevertheless, having watched Norm Abrams on PBS for years, it seems to me that a fairly easy way to check whether the bulkhead is perpendicular to the boat's centerline would be to measure from the same point on the forestay to each corner of the bulkhead. If the distance is the same on both sides, then it should be perpendicular. If it's only off by a small amount, it's probably insignificant.
Steve Milby J/24 "Captiva Wind"
previously C&C 35, Cal 25, C25 TR/FK, C22
Past Commodore
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dasreboot
Admiral

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803 Posts
Response Posted - 11/03/2016 :  09:20:24  Show Profile  Visit dasreboot's Homepage
quote:
Originally posted by Steve Milby

Maybe I'm missing something, but why does it matter? It will point north regardless of whether it is mounted or held in the hand and turned back and forth. .


its so the lubber lines actually show your heading. it's in the install instructions for any bulkhead compass. to have the lubber lines parallel to the fore and aft centerline of the vessel.
Todd Lewis
Eowyn 87 TR/WK C25 #5656
ARWEN 84 TR/SK C25 #4031
www.mainsailsailingschool.com
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Stinkpotter
Master Marine Consultant

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Djibouti
9013 Posts
Response Posted - 11/03/2016 :  09:29:30  Show Profile
quote:
Originally posted by Steve Milby

Maybe I'm missing something,...
Yup. There's a line on the compass that supposedly shows your heading. The compass could read 30 degrees, and the boat could actually be pointed at 34 if the compass is mounted on something that's 4 deg. from perpendicular to the keel. But the compass can be adjusted so the card lines up correctly with the line--instructions should be included. And I'm pretty sure the bulkhead is sufficiently perpendicular. Normal leeway will produce more course error than that.
Dave Bristle
Association "Port Captain" for Mystic/Stonington CT
PO of 1985 C-25 SR/FK #5032 Passage, USCG "sixpack" (expired),
Now on Eastern 27 $+!nkp*+ Sarge
Edited by - Stinkpotter on 11/03/2016 09:31:34
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dasreboot
Admiral

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803 Posts
Response Posted - 11/03/2016 :  09:29:49  Show Profile  Visit dasreboot's Homepage
found a procedure for aligning the lubber lines. google books is awesome.
https://books.google.com/books?id=jJPD_E0BoW4C&pg=PA90&lpg=PA90&dq=check+bulkhead+perpendicular+to+keel+compass&source=bl&ots=rrIsz3vvGV&sig=eU61-P9-GNg1ETNrFURF9js1lr8&hl=en&sa=X&ved=0ahUKEwiJrdud_4zQAhWFYiYKHVu7BQsQ6AEIITAB#v=onepage&q=check%20bulkhead%20perpendicular%20to%20keel%20compass&f=false
Todd Lewis
Eowyn 87 TR/WK C25 #5656
ARWEN 84 TR/SK C25 #4031
www.mainsailsailingschool.com
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Stinkpotter
Master Marine Consultant

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Djibouti
9013 Posts
Response Posted - 11/03/2016 :  09:34:45  Show Profile
I like my hand-bearing compass method better. Yes, using the deviation magnets. That also corrects for nearby magnets or ferrous objects that might throw the compass off. When that's an issue, the adjustment needs to be made from several headings, but it shouldn't be much of an issue on a C-25 (unless you have a big speaker close to the compass).
Dave Bristle
Association "Port Captain" for Mystic/Stonington CT
PO of 1985 C-25 SR/FK #5032 Passage, USCG "sixpack" (expired),
Now on Eastern 27 $+!nkp*+ Sarge
Edited by - Stinkpotter on 11/03/2016 09:39:10
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islander
Master Marine Consultant

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USA
3992 Posts
Response Posted - 11/03/2016 :  13:55:30  Show Profile
Not to discourage the use of a bulkhead compass but in this day and age its pretty old school. GPS chartplotters or even a compass app for your smart phone are way more accurate. I have a bulkhead compass and checking it against the heading on my GPS shows that it is fairly accurate but I rarely use it for a heading over the GPS. It does serve the purpose of filling a hole in the boat
Scott-"IMPULSE"87'C25/SR/WK/Din.#5688
Sailing out of Glen Cove,L.I Sound


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Stinkpotter
Master Marine Consultant

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Djibouti
9013 Posts
Response Posted - 11/03/2016 :  15:23:34  Show Profile
The key advantage to the GPS is it shows the heading that the boat is actually sailing, while the bulkhead compass only shows the direction it's pointed. On a beat, the two can be enough different, due to leeway and maybe a current, for the compass to cause you to not make a mark or a point you need to get around.

But any self-respecting sailor has to have a compass prominently displayed on the bulkhead or binnacle.
Dave Bristle
Association "Port Captain" for Mystic/Stonington CT
PO of 1985 C-25 SR/FK #5032 Passage, USCG "sixpack" (expired),
Now on Eastern 27 $+!nkp*+ Sarge
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islander
Master Marine Consultant

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USA
3992 Posts
Response Posted - 11/03/2016 :  16:19:23  Show Profile
You bet Dave, Along with the blue blazer with brass buttons!
Scott-"IMPULSE"87'C25/SR/WK/Din.#5688
Sailing out of Glen Cove,L.I Sound


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Stinkpotter
Master Marine Consultant

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Djibouti
9013 Posts
Response Posted - 11/03/2016 :  20:02:58  Show Profile
And do not forget the burgee lapel pin!
Dave Bristle
Association "Port Captain" for Mystic/Stonington CT
PO of 1985 C-25 SR/FK #5032 Passage, USCG "sixpack" (expired),
Now on Eastern 27 $+!nkp*+ Sarge
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dasreboot
Admiral

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803 Posts
Response Posted - 11/04/2016 :  05:23:13  Show Profile  Visit dasreboot's Homepage
I should get a burgee. I had one from the cheoy lee association. need one from here. and a blue blazer will go well with my khaki pants!
Todd Lewis
Eowyn 87 TR/WK C25 #5656
ARWEN 84 TR/SK C25 #4031
www.mainsailsailingschool.com
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islander
Master Marine Consultant

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USA
3992 Posts
Response Posted - 11/04/2016 :  07:09:26  Show Profile
Don't we all go yachting like this?
Scott-"IMPULSE"87'C25/SR/WK/Din.#5688
Sailing out of Glen Cove,L.I Sound


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Bladeswell
Captain

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USA
490 Posts
Response Posted - 11/04/2016 :  12:41:42  Show Profile  Visit Bladeswell's Homepage
Hello Everyone,

All that's missing is the white and black Captains hat. Gotta love this site. So much free intertainment.

Bladeswell
C25 TR FK Hull #973 1979 L-Dinette. So.Cal.
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Stinkpotter
Master Marine Consultant

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Djibouti
9013 Posts
Response Posted - 11/04/2016 :  13:24:25  Show Profile
Check his right hand.
Dave Bristle
Association "Port Captain" for Mystic/Stonington CT
PO of 1985 C-25 SR/FK #5032 Passage, USCG "sixpack" (expired),
Now on Eastern 27 $+!nkp*+ Sarge
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Bladeswell
Captain

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USA
490 Posts
Response Posted - 11/04/2016 :  13:41:37  Show Profile  Visit Bladeswell's Homepage
LoL,

Wow Dave, you have a good eye.


Bladeswell
C25 TR FK Hull #973 1979 L-Dinette. So.Cal.
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sethp001
Mainsheet C-25 Tech Editor

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814 Posts
Response Posted - 11/04/2016 :  17:44:08  Show Profile
I can't find a blazer to go with my shirt.


Seth
"Outlier" 1987 Catalina 25 SR/SK/Traditional Interior #5541
"Zoo" 1977 Morgan Out Island 30
"Nomad" 1980 Prindle 16
"Lost" 1988 Catalina Capri 14.2 (sold - yay!)
"Marine Tex 1" Unknown Origin POS 8' Fiberglass Dinghy
https://whichsailboat.com/2014/07/27/catalina-25-review/
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Stinkpotter
Master Marine Consultant

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Djibouti
9013 Posts
Response Posted - 11/05/2016 :  07:55:48  Show Profile
Here's one for ya...
Dave Bristle
Association "Port Captain" for Mystic/Stonington CT
PO of 1985 C-25 SR/FK #5032 Passage, USCG "sixpack" (expired),
Now on Eastern 27 $+!nkp*+ Sarge
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