I should resist the urge of piping up, but since I have the same
problem (a Loran installed by the previous owner but no manual) I want
to put in a plug for having MORE than just 1 single device to rely on
for finding your position. For one, I do own a handheld GPS that I use
during all my cruises (to find where I am, where I should be going, and
how fast I go over ground). It's great, but it's "handheld", which
means there is always that chance that it gets dropped overboard,
forgotten to take along, batteries go dead, etc. (On my last trip I
encountered a guy on a powerboat off the Poquoson River going north who
asked me for directions to the James River since he "had forgotten his
GPS". For people outside the Southern Chesapeake Bay - that's about a 6
hour sail off! - but no biggie for a fast powerboat, I guess.
Anyway, I hate to toss an obviously still working (and quite
sophisticated) instrument that can serve as a backup in a pinch. Plus,
while I haven't quite figured out how to operate my Loran (no
manual...), it does have an "anchor alarm" feature which my handheld
GPS doesn't and which could give me some piece of mind in a rough
anchorage. BTW, I remember reading an instructive article a few months
ago (I guess in "Sailing" magazine) about the false sense of precision
BOTH of these devices (Loran and GPS) can give you - if the map hasn't
been resurveyed in the last 20 years (many haven't if they are outside
major shipping channels), it can be easily off by much more than the
apparent precision of our fancy location finders. Plus, sand bars do
wander over time (as I and others I observed have found out the "hard"
way...)
- Sebastian