NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
From: Byron Franklin
Date: 2013 Mar 25, 09:53 -0700
Byron: Fix accuracy and fix Guidelines, This information was in the Navy instruction of
2005, so may be close to today standards? Table 3A below
area distance from land or shoal water) fix accuracy Fix interval accuracy
Restricted water less than 2nm 50 yds 2 min 50yds
pilot waters 2-10nm 100 yds 3-10 min min
coastal waters 10-30nm 500 yds 15- 30 min.
open water 30+nm 1500 yds 30 or more more.
.
I am use to the GTMO Cuba navigation exercise, in restricted water less than 50 yds was counter as zero error points against the ship’s position error. The navy has the extra men to do the above, it is good training to try to keep the navigation in and out of port to these standards, I don’t believe many ships can stay under these distance especially coastal and open waters
I cannot copy direct from the Inst. It is too wordy. . Only as I can read.
Instr reads “To facilitate this transition to electronic navigation all ships may use GPS as their primary
fix source in all waters. This does not preclude the navigation team to ascertain the ships position by other means (visual, radar etc.)As required and at no greater than every third fix interval in restricted waters. No one fix source should be solely relied upon. If GPS exceeds those limits established in
table 3-A, the ships navigation team will shift to an alternate fix source as the primary fix source. CPS datum must be set according to the chart in use”. Note above restricted waters, ever third fix must include (visual Radar, etc. Pilot on board or not the navigation team must get fixes. The Other than Navy ships will not have the men to do the above and uses the Pilot for they Navigation safety I understand?.
Hope a merchie will give their rules and regulations for entering port or restricted waters.
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