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    Re: Bris accuracy?
    From: Alexandre Eremenko
    Date: 2004 Nov 8, 14:03 -0500

    This is amazing!
    It seems to be in the same precision class as the best
    brass sextants. Did you use the natural horizon?
    As I understand it measures only some discrete
    pre-assinged set of possible altitudes, so you
    have to wait and only to record the time when
    such pre-assigned altitude is reached.
    How frequently this happens? I mean how long
    you have to wait in the average?
    Or, which is the same, what is the typidal difference
    between these pre-assigned apltitude values?
    On Mon, 8 Nov 2004, Royer, Doug wrote:
    > Here are some results from last Sat. (11-06-04) and Sun. (11-07-04)
    > positions useing the Bris. 3 differant alts of the Sun taken at 3 differant
    > times of day from the same terrestial position.No averaging used as when the
    > image of the Sun is where it needs to be(on the Bris) as according to the
    > user instructions the time is noted and each sight is reduced to find the
    > LOP.
    > Both days the position by GPS coordinates:
    > 32* 49' 24" N
    > 116* 49' 49" W
    > 11-06-04 most probable position.2 alts and times during the morning hrs and
    > 1 alt and time during the late afternoon hrs:
    > 32* 49' 31" N
    > 116* 50' 07" W
    > This is between 600 - 650 yds differance at a bearing of 288* T from the GPS
    > pos.
    > 11-07-04 most probable position. 1 alt and time in the morning hrs and 2
    > alts and times during  the later afternoon hrs:
    > 32* 49' 36" N
    > 116* 49' 43' W
    > This is between 400 - 500 yds differance at a bearing of 012* T from the GPS
    > pos.
    > This is only the 4th weekend I've had to play with this instument and the
    > "accuracy" of the MPP is getting better the more I use the instrument.

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