Cruisers Forum

Join CruisersForum Today

Thread Tools Rate Thread Display Modes
Old 27-09-2008, 16:27   #16
Registered User

Join Date: Sep 2008
Posts: 5
The compass is located about 4 feet from the engine.

hns1934 is offline   Reply With Quote
Old 27-09-2008, 17:12   #17
Registered User
Microship's Avatar

Join Date: Dec 2005
Location: living aboard in Friday Harbor, WA
Boat: Amazon 44
Posts: 699
Images: 7
I went with a rate gyro compass (Maretron SSC200) on my steel boat, and hesitated somewhat when placing it in the fiberglass instrument pod over the companionway... since that gap in the steel deck introduces a scary 35-degree variation when moving up and down with a hockey-puck compass. Reassured by Maretron, I went ahead and mounted it, then ran through the calibration by doing multiple controlled circles at a constant rate of turn (see below for the track... there was a little current running in the channel). Astonishingly, it's now correct to the degree, perfectly tracking the binnacle compass that has been professionally swung.

Attached Thumbnails
Click image for larger version

Name:	compasscal.jpg
Views:	155
Size:	59.4 KB
ID:	5237  

S/V Nomadness
Nomadic Research Labs
Microship is offline   Reply With Quote
Old 27-09-2008, 18:48   #18
Registered User
speciald@ocens.'s Avatar

Join Date: Apr 2008
Location: On the boat - Carib, Chesapeake
Boat: 58 Taswell AS
Posts: 1,139
I had one mounted beneath the floor of the hanging locker in the aft cabin. It worked fine until my wife put her Thigh Master in the locker.
speciald@ocens. is offline   Reply With Quote
Old 21-08-2010, 08:47   #19
Registered User

Join Date: Aug 2010
Posts: 1
I know this is an old thread, but I though I would add this if anyone was still curious/listening.
The topic came up in a GSP thread and I went searching for some answers but haven't found the exact one I was looking for. This thread indicates some misunderstanding of flux-gate - so what I know so far.

2-axis flux-gates, which most are, are sensitive to two things
1. level
2. magnetic materials.

change the level of the sensors by more than a couple degrees and the direction changes significantly. 3-axis flux-gates do not have this issue.

MOVE the sensors into different magnetic environments and the direction indication change also makes it unusable.

THEREFORE, it does not make a difference WHERE u place the flux-gate in the boat as long as u calibrate it before use AND do not move it or any magnetic material in or into its space - say 3' - during use.
Again a 3-axis flux-gate has been -reported- to not suffer from this error and the reason for that is what I am searching for now.

Since magnetic fields on Earth vary in different locals, the flux-gate needs to be periodically calibrated as u move its location relative to the Earth as from port to port. - but then if the above is true re the 3-axis, then it should not require re-calibration in this instance - which is hard to believe.

I will just keep searching.

ruggb is offline   Reply With Quote

compass, fluxgate, raymarine

Thread Tools
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
Fluxgate Compass Question Dockhead Marine Electronics 3 31-05-2010 05:58
Fluxgate Compass bob_77903 Navigation 10 27-02-2009 20:07
Furuno PG-500 Fluxgate compass meridian@ Navigation 4 06-11-2008 04:33
Raymarine Fluxgate Compass coaster Marine Electronics 21 28-03-2007 21:27
Mounting fluxgate compass off Centerline?? alanperry Marine Electronics 22 13-07-2006 15:49

Our Communities

Our communities encompass many different hobbies and interests, but each one is built on friendly, intelligent membership.

» More about our Communities

Automotive Communities

Our Automotive communities encompass many different makes and models. From U.S. domestics to European Saloons.

» More about our Automotive Communities

Marine Communities

Our Marine websites focus on Cruising and Sailing Vessels, including forums and the largest cruising Wiki project on the web today.

» More about our Marine Communities

Copyright 2002-2015 Social Knowledge, LLC All Rights Reserved.

All times are GMT -7. The time now is 18:42.

Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2016, vBulletin Solutions, Inc.
Social Knowledge Networks
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2016, vBulletin Solutions, Inc.

ShowCase vBulletin Plugins by Drive Thru Online, Inc.