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    Re: Amplitudes
    From: Byron Franklin
    Date: 2011 Aug 26, 09:35 -0700

    I may have missed the later talk about the Amplitude, let me explain some of my like for the Amplitude. The Amplitude is taken with the same instrument that is used to take bearings navigation coming in to port.So if their is instrument error let it be the same. Another, I have found that the Azmuith Circle to be a greater error, with it's bubbles and the greater altitude and alignment of the system. I at one time was sent around to see why a ships had bad fixes while in danger waters. Most of the time I check the Azimuth book and founded that the Azimuth was near zero, but! the yards set the gyro with the Circle, so the ship would be unaware of the error. I would use my Franklin Techique to find the error, some times with the ships own underway transiting plots,small or large triangles. That I could collapes to pin point fixes. Them take a Azimuth using their circle to compare the difference. I have written on this before(Check your cicle before SETTING GYRO better, use the Franklin) At sea The Navy is to check the gyro every day if possible, sun stars whatever and record the gyro error in a gyro book for only that purpose. The Amplitude is very trustful even at higher LAT 45+ (very high LAT'S no.)Sun or bodies move toward you so that a very good bearing can be observed.
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