NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: GPS trick: compass rose waypoint
From: Andrew Corl
Date: 2010 Feb 16, 04:24 -0800
From: Bill <billyrem42@earthlink.net>
To: NavList@fer3.com
Sent: Mon, February 15, 2010 10:13:28 PM
Subject: [NavList] Re: GPS trick: compass rose waypoint
> If you're doing ordinary small boat sailing on a local chart, enter the
> coordinates of the center of the compass rose on the chart as a waypoint in
> your backup handheld GPS unit. Then you can ask it for bearing and distance
> from that waypoint at any time.
I too have been doing this since I obtained my first GPs, about ten years
ago.
On my Great Lakes Charts once a logical area for the compass rose is
determined, its placement in the area seems almost random. The center of the
rose does not seem to "snap" to any major or minor latitude or longitude
lines.
Any ideas of how a cartographer decides the exact location of the roses?
Bill B.
From: Andrew Corl
Date: 2010 Feb 16, 04:24 -0800
I took some courses in Cartography in college about 16 years ago. We had to prepare a nautical chart as one of the projects and it included two compass roses. I don't recall any particular guidelines though I am sure there are some out there somewhere. We had to make sure that there were two and they were in locations where they would be of use to the mariner.
Andrew
From: Bill <billyrem42@earthlink.net>
To: NavList@fer3.com
Sent: Mon, February 15, 2010 10:13:28 PM
Subject: [NavList] Re: GPS trick: compass rose waypoint
> If you're doing ordinary small boat sailing on a local chart, enter the
> coordinates of the center of the compass rose on the chart as a waypoint in
> your backup handheld GPS unit. Then you can ask it for bearing and distance
> from that waypoint at any time.
I too have been doing this since I obtained my first GPs, about ten years
ago.
On my Great Lakes Charts once a logical area for the compass rose is
determined, its placement in the area seems almost random. The center of the
rose does not seem to "snap" to any major or minor latitude or longitude
lines.
Any ideas of how a cartographer decides the exact location of the roses?
Bill B.