Since DR is defined as determining one's position by projecting course and
speed, its a little hard to see how an effective DR is maintained without a
compass. I suppose you could call the navigation employed by the Vikings and
other Artic travelers, or the Polynesian voyagers "DR without a compass" but I
would call it a different style of navigating, not DR as defined by Bowditch.

You can make a slightly better case that piloting doesn't require a compass,
since there are some piloting techniques that don't use one.



"DD730" wrote in message
y.com...
The use of a compass is neither necessary nor sufficient to DR and/or
Piloting.
But it can help.

Jeff Morris wrote:
I would think a compass is implied by DR and Piloting. Is there some
other use you're thinking of?


"DD730" wrote in message
y.com...
Compass


Joe wrote:
(Suzy Brody) wrote in message
. com...
Bill, this is a pointless comment and it adds nothing to this
topic.

Suzy


Thanks Suzy,

And since your new here I give you a few answers and see if
you can guess a few others....OK

1. GPS
2. Loran
3. DR
4. celestial
5. Radio Direction

Anyone feel free to ad to the list.

Joe