NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: GPS versus sextants ?
From: Peter Fogg
Date: 2002 Feb 6, 16:53 +1100
From: Peter Fogg
Date: 2002 Feb 6, 16:53 +1100
'I think we must consider the sextant to be a pursuit of intellectual exercise and curiousity--not a superior navigational instrument.' As prudent mariners we try to have back ups for our back up systems. So we have GPS (truly a wonderful machine - an impossible dream come true, thanks to the US Military - ain't life strange) and we have a sextant and if all that fails, along with the rest of our instruments, then our understanding of celestial navigation and, more particularly, the way the celestial bodies move around the sky should give us a third tier of navigational imputs. The sun by day and the stars by night will be our compass ESPECIALLY if we know where to expect them (azimuths of setting and rising, for example) because we have regularly been practising our celestial navigation. Similarly at night we can find south by reference to Crux and the Pointers (in the southern hemisphere). Even if we were concussed, as Jared mentioned, their relative positions would even remind us which season it was. If we can remember the azimuths of the stars we have been regularly observing, at dawn and dusk, that will give us a rough compass to steer by. I couldn't pretend to be able to navigate by reference to the changing position of a zenith star, or the regular rising and setting of the night sky throughout the night, but I know others have done just that. We would still be running a DR plot, even if it was only in our heads, and taking a great interest in everything around us: the track of a bird passing, for example, would be of great interest - in the morning; where is it coming from, in the evening; where is it returning to? This is what I meant by a difference in attitude, nothing to do with the virtues of one machine over another. The pleasure of the pursuit of intellectual curiosity is a bonus.