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    Milli-radian
    From: Doug Royer
    Date: 2003 Mar 12, 10:41 -0800

    Thanks to you guys an area of puzzelment has been cleared up for me.I often
    wondered how a unit of linear measurement 0.001 was called a mil or a
    thousanth.Milli-radian.It makes sense to me now.A unit of angular measure
    over a short distance (relative) would appear as a straight line.Much like a
    rhum line on a Mercator projection.
    I have 2 mil or lensatic compasses.One is the Cammenga lensatic compass and
    the other is an older Soviet Bussol compass.The Cammenga is handheld and the
    Bussol is a bit larger and can be mounted on a tripod.The Bussol may be more
    accurate due to the greater number of mil markings on the card face.The
    Cammenga is mil marked for every 5 mils and the Bussol has markings at what
    appear every 2 mils.It is also interesting in the post yesterday to discover
    that Russian and US mil markings differ and I will dig deeper into this
    area.I don't know the differance between the Cammenga and the US-M2 compass
    but will find out today.The Bussol also has a contraption for what appears
    to find elevation.It was most likely used to lay artillary positions.I can't
    find any documentation on this compass but you have given me some insight on
    figureing out how it works.
    Ever since joining this group I haven't had a chance to read any books as I
    am reading through years of your archives.What a store of knowlage and
    information! I've never thought of or considered doing Lunar distance
    observations but now that I have some time it sounds like a real challange
    to attempt them.
    Back to the Cammenga mil-compass.The bezel has a ratchet and is 120 clicks
    per rev.Each click is = 53.333 mils or 3*.Each 1* is = 17.778 mils.
    1 mil subtends 39.37 in. {at} 1,000 yds.
    1 min. of angle subtends 11.83 in. {at} 1,000yds.
    1 sec. of arc subtends 0.2 in. {at} 1,000 yds.
    On to the UTM projection.UTM's have Northing and Easting coordinates.Each
    section of the globe has differant East + West and North + South letters
    designating the desired area to use as a prefix to the Northing and Easting
    coordinates.Grids are marked as 1,000 meter boxes.Resolution is as follows.
    6 digit Northing and Easting coordinates = 100 meter accuracy
    8 digit coordinates = 10 meter  accuracy
    10 digit coordinates = 1 meter accuracy
    Gentleman,I have to run and do something now so I'll finish later.
    
    
    

       
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