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    Distance off useing a hand held compass
    From: Doug Royer
    Date: 2003 Mar 25, 12:06 -0800

    The following is a proceedure to find or estimate the distance off an object
    using a handheld compass.This is a quick dirty way of finding distance when
    other means are unavailiable.For you who are concerned with great accuracy
    measurements just disreguard the following.A higher quality sighting compass
    may yield more accurate results.This is a good method for getting the
    distance off of an object that is hard to reach due to terrain.
    
    
                                                                 o
    
                                                                  .
                                                                  |
                                                                  |
                                                                  |
                                                                  | d
                                                       A         |           B
    
    a.-------------------------------.b
                                                              ref.
    d = distance to be calculated
    A = greater value of measured bearing
    B = lesser value of measured bearing
    a = 1st point of referance distance
    b = 2nd point of referance distance
    ref = measured referance distance
    d = (tan(90-(A -B))) x ref.
    It is imperative to lay the ref. line perpendicular to the object for more
    accurate results.
    1. Lay out referance line.I use a 10 meter cord.
    2. Take a compass bearing from a to o.
    3. Walk to the end of the ref. line and take the bearing b to o
    4. Subtract the larger bearing from the smaller bearing.If B is larger than
    A switch positions in the equation.
    5. Work the equation and the result will be the distance off the object.
    Hopefully this diagram will be transmitted better than the one yesterday.In
    fact if this diagram goes through it was basically the same set-up as
    yesterday's diagram.
    
    
    

       
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