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    Re: Relative bearings
    From: Paul Hirose
    Date: 2015 Apr 15, 21:06 -0700

    On 2015-04-14 14:46, Bill B wrote:
    > Borrowing from submariner terminology it makes communications/notations 
    easier for me to use "Angle of the bow" or "AOB" noting port or starboard 
    when necessary.
    Unless terminology has changed since WW2, "angle on the bow" doesn't
    mean relative bearing in submarines. Well, actually it does, but it's
    the relative bearing from target ship to sub, increasing port and
    starboard from the target's bow. For instance, port 90 angle on the bow
    means the sub is on the target's port beam, regardless of the relative
    bearing *to* the target.
    That meaning is also made clear by former fleet boat skipper Edward
    Beach in his classic war novel "Run Silent, Run Deep". If you've seen
    the movie you'll hardly recognize the book, which puts less focus on
    interpersonal drama and more on technical detail.
    It even has some navigational stuff, such as the factors that affect the
    time you come to the surface in enemy waters. Right after sunset is best
    for the executive officer (the navigator on submarines) to get a sharp
    horizon for his star shots. That's important when you've been running
    submerged all day without a fix, says "Richardson", the novel's
    narrator. On the other hand, waiting till it gets dark makes you less
    vulnerable to attack.
    Other than in subs, "angle on the bow" has been used for relative
    bearing from own ship. For example, see one of the most authoritative
    British texts of its era (Martin, 1899):
    (near bottom of page)

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