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Geoff put forth a good argument for GPS. On the ocean we don't need that kind
of accuracy to know that we are in a 5 mile radius is quite good enough until
we approach land then we need increased accuracy. Of course we usually
get very accurate sextant positions if the weather conditions are OK. The larger the
vessel the more accurate your positions. Speed in working a sight; depends on
your experience and method used. I have had 4 stars plotted within a time of
8 min. and that include the observation. GPS is a marvellous piece of equipment
however problems such as malfunction breakdown on board are ever present
possibilies and I believe there is comet coming with it's associated debris. This
has been publicised in a number of tech. mags. and there is a possibility of
comet debris doing damage to sattelites. So we need a backup for GPS and that
is Celestial Nav. and if we have an overcast day then we use DR and also if
we are nearing land we sweat it out until we pick up something on radar and the
echo sounder. Having GPS is great but we need that Celestial backup and in any
case we purists would't neglect our morning, daytime and evening sights for
anything.
Regards,
Barrie Hudson.

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