How about:
Depth Sounder
Bottom from lead line
Sound from fog horns & bell/gong buoys
RADAR

Also, "DR" doesn't include Piloting, or using local geographic features.



"Joe" wrote in message
om...

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