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There are some compass adjusters whose experience may be limited and do not correct for or even understand what vertical healing error is, and if they express any hesitation about making this correction or don’t seem to understand what you are talking about, find another compass adjuster! Incidentally, this vertical heeling error correction is only valid for the magnetic latitude at which the compensation was made. If the vessel is expected to go on long ocean voyages where the latitude will change by more than approximately 5 degrees, an additional correction made with “Flinders Bars” should be carried out. Just as horizontal compensation requires quadrantal spheres (soft iron balls) to be placed around the compass, vertical compensation also requires a vertical soft iron corrector to be mounted and operated in conjunction with the vertical heeling error magnet to maintain compensation over wide latitude changes.
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