NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: News Item on Over-reliance on GPS
From: Peter Fogg
Date: 2008 Nov 9, 20:41 +1100
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From: Peter Fogg
Date: 2008 Nov 9, 20:41 +1100
Fred wrote:
I would have thought the primary system remains dead reckoning, Fred. Starting from a known point and plotting movement across the chart, according to speed, direction and time. Corrected and tested along the way with whatever other position-indicating methods are available:
Compass bearings on shore objects, a line of position derived from a radio transmitter, birds flying towards land, changes in the patterns of waves, if you can read them, the observation of zenith stars ... GPS ... whatever.
Either the 'complicated GPS "system"aboard' is the primary system or the sextant is.
I would have thought the primary system remains dead reckoning, Fred. Starting from a known point and plotting movement across the chart, according to speed, direction and time. Corrected and tested along the way with whatever other position-indicating methods are available:
Compass bearings on shore objects, a line of position derived from a radio transmitter, birds flying towards land, changes in the patterns of waves, if you can read them, the observation of zenith stars ... GPS ... whatever.
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Navigation List archive: www.fer3.com/arc
To post, email NavList@fer3.com
To , email NavList-@fer3.com
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