The magnetic compass, yay or nay?
At right is a aft-looking view of the Eastbay helm I visited last week. You can see some serious wood work that puts the steering compass right where you’d want it. The problem is that this compass performs poorly; apparently its deviation error varies with the status of various electronics and is therefore not correctable. I hear this story all the time. And the second part of the story is like most: the owner doesn’t much care, as he’s content with the COG and heading readings he gets from his GPS and the electronic compass in his autopilot. In fact, of the 4 new J-100s launched in my harbor this summer (there’s a sailboat model on fire!), only one has a magnetic compass (but all have 12” multifunction displays!). That really surprised me as sailors tend to be the most compass obsessed of boaters. What’s going on? Is the traditional compass going the way of the paper chart? Is there one on your boat? Is it adjusted properly? Do you use it? I’d appreciate your thoughts.
It happened that a very experienced compass adjuster I know stopped by yesterday. He told me that the compass above is a poor quality Danforth, and that a similarly sized Ritchie SS-2000 would likely do a better job. I’m hoping to tag along with Jeff on an adjustment job, and learn more about how to make a magnetic compass work well around a modern helm full of electro-magnetic forces.
By the way, the odd little frame next to the compass above is a serial port so that routes and waypoints can be uploaded into the Northstar 6000i’s via NMEA 0183.
Swingship, and getting a compass right
September 8, 2005
A World Magnetic Model reminder, courtesy Maretron
February 18, 2010
Garmin Radar & Maretron Compass, puzzles!
July 13, 2008
Compass deviation, who’s responsible?
September 16, 2005