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    Re: Navy Navigation Regulation Manual
    From: Byron Franklin
    Date: 2009 Dec 4, 19:34 -0800

    Yes the CO can name CIC primary,and the Radarman can get that good fix
    off quickly,but a trained QM team can get and plot a visual in easy 10
    seconds. I am glad that they got the QM's to CIC training.
    I did write about the Intrepid and the in fog grounding.I resonnaly
    visit a friend that teaches there. He showed me a radar that tracked
    about 11 targets with course, speed and CPA of each.	COMNAVAIRFORINST
    3530.4A/
    �	COMNAVSURFORINST 3530.4A
    24 Feb 05
    APPENDIX H
    NAVIGATION SYSTEMS/EQUIPMENT
    1. Global Positioning System Figure of Merit (FOM) is an integer
    representation of position error (3 dimensions, 1 sigma) as shown in
    the table below and reflects the following �predictable� errors:
    a. Receiver state and navigation mode
    b. Availability/accuracy of ionosphere corrections
    c. Satellite geometry (Dilution of Precision � DOP)
    d. Degradation due to SA exclusion
    e. User range accuracy effects
    Expected Position Error
    Figure of Merit
    1Less than or equal to 27.3YDS
    2Greater than 27.3 Less than 54.7YDS
    3Greater than 54.7 Less than 82YDS
    4Greater than 82 Less than 127.3YDS
    Greater than 127.3 Less than 218.6YDS
    6Greater than 218.6 Less than 546.6YDS
    7Greater than 546.6 Less than 1093.3YDS
    8Greater than 1093.3 Less than 5466.6YDS
    9Greater than 5466.6YDS
    Additional errors may be introduced by anomalies in the satellite/
    control station and/or hostile actions that result in range error
    above the operational tolerance. These errors are different from the
    predictable degraded accuracy described above. GPS integrity refers to
    the ability of the system to
    Provide a timely warning to users when it should not be used for
    navigation. However continued use of visual and radar plotting
    provides the necessary integrity of the navigation system.
    
    
    On Dec 4, 9:34�am,  wrote:
    > Yes, Master Chief, keep 'em coming. �Not that everything is practical or 
    practiced, but this stuff can be excellent learning aids for any mariner.
    >
    > Now I have a question, regarding COMNAVSURFORINST 3530.4A paragraph 4, which 
    relaxes the visual fix interval when using GPS as primary. �Is there a rule 
    stating how fast the GPS should be logging or resetting the inertial in 
    various waters? �I'm thinking of the modern Voyage Management System (VMS) 
    using GPS/inertial as primary. �Civilian aviation has very specific rules as 
    to how fast the GPS needs to reset the inertial, and the pilots here can 
    chime in as to what their rules are.
    >
    > My time was paper plots and sound powered phones to the bearing takers. �I 
    wonder how many know "primary" plot was in CIC unless inside the sea buoy or 
    with a working pilot? �Makes sense when you consider that the ship is fought 
    from CIC. �We didn't waste training time on my ships. �QM training included 
    the OS's who did the CIC plot. �The OS's were generally faster at plotting 
    than the QM's - fewer distractions in the air-conditioned cave.
    >
    > Joe
    
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