Cruisers Forum

Join CruisersForum Today

Thread Tools Search this Thread Rate Thread Display Modes
Old 24-07-2018, 02:57   #1
Registered User

Join Date: Jan 2007
Location: Surrey, England
Boat: Prout Quest 33CS, 33ft, "Cat-a-tonic"
Posts: 7
Cautionary compass tale

Had an interesting experience with my compasses recently. The main ship's compass leaked and the card toppled so I replaced it. Luckily the latest version still fits the old holes so easy job (Plastimo Contest 101). To calibrate it I used my hand bearing compass (Plastimo Iris 50) but soon realised that the bearing was adrift by up to 20 degs. Did lots of sighting on known bearings and convinced myself the hand bearing compass was also faulty. So bought a new one but comparing the old and new Iris 50's gave the same results. Checked against noon sun (actually 12:09:19 for corrected sun's noon for my position). They still seemed way out. However I put them on the ground against a stick's shadow and, bingo, spot on - due South. Back up to my eye - 20 degs out. Light bulb moment - it's my new spectacles - enough metal to affect the compass. Sorted and the new ship's compass can be calibrated with confidence - new plastic specs for sailing in future.

Cat-a-tonic is offline   Reply With Quote
Old 24-07-2018, 03:07   #2
Senior Cruiser
SV Bacchus's Avatar

Cruisers Forum Supporter

Join Date: Apr 2016
Location: Presently cruising the Bahamas
Boat: Leopard 42 OV
Posts: 1,215
Re: Cautionary compass tale

Very interesting, good info to know. Thanks!

SV Bacchus - Living the good life!
SV Bacchus is offline   Reply With Quote
Old 24-07-2018, 15:36   #3
Registered User
Kim Gregory's Avatar

Join Date: Feb 2015
Location: Toronto
Boat: Douglas 32
Posts: 100
Re: Cautionary compass tale

This problem can be REALLY bad if you have the magnetic 'clip-on' sunglasses!
Kim Gregory is offline   Reply With Quote
Old 24-07-2018, 17:19   #4
Registered User

Join Date: Feb 2015
Location: Green Bay WI
Boat: 2001 Catalina 36
Posts: 120
Re: Cautionary compass tale

I needed to have my autopilot replaced. Done professionally by a person I really respect. My ships compass is now 25 degrees off. The drive was changed from the right side of the wheel to the left. He says he has done this before and no one noticed a problem. He thinks they never checked their compass. The plan is to put the unit back on the other side.
dangerfield55 is offline   Reply With Quote


Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes Rate This Thread
Rate This Thread:

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

Similar Threads
Thread Thread Starter Forum Replies Last Post
For Sale: Catamaran: Cautionary Tale for Wannabe Cruisers Jane.Joy Classifieds Archive 118 08-10-2013 09:59
A Cautionary Tale Jolly Roger General Sailing Forum 26 25-04-2013 18:53
A cautionary tale: Or trip report of Bellingham to Astoria. s/v Beth The Sailor's Confessional 3 06-06-2012 15:21
A Cautionary Tale Godwits Meets & Greets 21 06-12-2010 09:48

Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -7. The time now is 23:15.

Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2019, vBulletin Solutions, Inc.
Social Knowledge Networks
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2019, vBulletin Solutions, Inc.

ShowCase vBulletin Plugins by Drive Thru Online, Inc.