NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Determing the bearing off a celestial object.
From: Bruce J. Pennino
Date: 2015 Mar 28, 14:46 -0400
Bruce
From: Bruce J. Pennino
Date: 2015 Mar 28, 14:46 -0400
Hi:
From time-to-time surveyors use a hand compass to relocate a “lost” line.
Must allow for present and past magnetic variations. I believe quality hand
compasses can be better than a few degrees on land. I don’t have a really good
hand compass, but on land I’m thinking you can get 1-2 degrees accuracy.
On a boat.......wow, I would not even guess at the accuracy. Maybe depend
on direction etc. On a boat it would be easy to do a few tests with a
“hockey puck”, compare to boat’s compass, and compare to a chart. Coastal
navigators.......what say you?
Bruce
From: Herman Dekker
Sent: Saturday, March 28, 2015 2:36 PM
Subject: [NavList] Determing the bearing off a celestial
object.
In some books you read determ the bearing off a celestial object.
How can you do that reliable?
Is there a special compass or so for this
purpose?
With a normal magnetic bearing compass you can look only a few
degrees upwards
before the compassrose stalls.
A compass with pelorus may works perhaps, but who has that, with a free
sight
around a yacht?
So who has the solution for this?
regards
HermanD
