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    US. Navy fix accuracy and Interval.
    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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