GPS question - Page 2 - SailNet Community
LinkBack Thread Tools
post #11 of 14 Old 04-19-2004
Senior Member
Join Date: Feb 2003
Location: New England USA
Posts: 261
Thanks: 0
Thanked 2 Times in 2 Posts
Rep Power: 15
GPS question

I would imagine that you may be seeing the effect of a lot of techology in one handheld unit. I think that the electronic compass in the Garmin is more suited to overland "Orienteering" than precise marine navigation.

The price of a good fluxgate comapass for one of the modern integrated navigation/information systems is more than the entire 76S! I have a nice Autohelm/Raytheon hand bearing digital compass that is very accurate but was about $150 or so. Add on all the features of the 76S and, well, they had to scrimp somewhere!

Even my two trusty 7" Danforth Constellations, zeroed to within a degree of each other, move whenever ANY ferrous metal or electronic device comes near them.

Just remember that if you turn off your 76S compass, the resulted calculated heading will be over the ground, which means with a beam current, you may be off 10 - 20deg from your magnetic heading. And if you are not moving, you won''t get any heading reading at all.
Silmaril is offline  
Quote Quick Reply Share with Facebook
Sponsored Links
post #12 of 14 Old 04-22-2004 Thread Starter
Junior Member
Join Date: Jun 2003
Posts: 15
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
GPS question

For anyone who became interested in this discussion.... I finally got in touch with a knowledgeable person at Garmin. It took several calls and a lot of time on hold. Basically he told me that the electronic compass feature on the Garmin 76S and a couple of other Garmin units are pretty much for walkers but not for sail or aviation use. In other words, one can use the unit to obtain heading over the ground when moving (just like any other GPS) but the compass is not great for obtaining direction steered. In order for the electronic (fluxgate) compass on the Garmin 76S to work well the unit has to be held flat and not be around any metal or magnetic fields, both of which are pretty common in a cockpit. He suggested disarming the electronic compass (which I cannot figure out how to do) or at least changing the factory default setting so that the unit utilizes the GPS to obtain heading at low speeds and not the compass (easy to do and the instructions in the manual are straightforward).
wallm is offline  
Quote Quick Reply Share with Facebook
post #13 of 14 Old 05-10-2004
MHRitter's Avatar
Join Date: Feb 2001
Location: Northeast Wisconsin
Posts: 31
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
GPS question

You might try downloading the manual and then doing the search for words or combinations of words to disable the compass. The compass decreases battery life by almost 50%. I often us my GPS 12 get the boat headed in the right direction and once that happens I use the old compass to steer and turn off the GPS.

Next Milwuakee GPS Seminar is Jne12th see it at
MHRitter is offline  
Quote Quick Reply Share with Facebook
post #14 of 14 Old 05-30-2004
Junior Member
Join Date: May 2004
Posts: 7
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
GPS question

Most GPSs have the option to show true heading or Magnetic (this is done automatically as they know where they are). Which way have you set your default?

NickLindsley is offline  
Quote Quick Reply Share with Facebook

Quick Reply

By choosing to post the reply above you agree to the rules you agreed to when joining Sailnet.
Click Here to view those rules.

Register Now

In order to be able to post messages on the SailNet Community forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
Please note: After entering 3 characters a list of Usernames already in use will appear and the list will disappear once a valid Username is entered.

User Name:
Please enter a password for your user account. Note that passwords are case-sensitive.


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:


Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page

Similar Threads
Thread Thread Starter Forum Replies Last Post
Mast Question Vastbinder General Discussion (sailing related) 8 03-15-2005 07:42 AM
Old question about spinnakers and racing turbo87 Racing 3 11-17-2002 11:31 AM
A question to all boat owners Apollo18 Crew Wanted/Available 6 12-31-2001 08:14 PM
1973 Norlin 34 question pcalvert Boat Review and Purchase Forum 0 10-13-2001 11:42 AM
''84 Evinrude 9.9 spark question BrianConley Gear & Maintenance 0 08-05-2001 07:51 PM

Posting Rules  
You may post new threads
You may 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 On
Trackbacks are On
Pingbacks are On
Refbacks are On

For the best viewing experience please update your browser to Google Chrome