NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Longitude by compass variation
From: Andrés Ruiz
Date: 2025 Jun 5, 09:04 +0200
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From: Andrés Ruiz
Date: 2025 Jun 5, 09:04 +0200
Just to add some pics: OpenCPN ECS with Isogonic lines for the current day.
And some Navigational Algorithms apps:
Magnetic compass (Windows)
Variation (android) Navigational Algorithms - android
Longitude by magnetic compass variation, can be used in the same manner as:
Position by Echo Sounder
I am sure not many discuss this as the position fixing method. Rightly so. We have so many resources and we do not need to rely on echo sounder for position fixing.
But as I said, when the GPS fails we start doubting everything and each equipment. More methods of reassuring us about position can be handy.
Echo sounder cannot be used as a position fixing tool but it can be used to confirm the known position of the ship.
... As I said this is not the position fixing method. But we can use this as a confirmation tool for the position we get from other methods.
Fair winds.
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