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    Re: Ocean Yachtmaster Exercises
    From: Paul Hirose
    Date: 2008 Aug 17, 10:33 -0700

    George Huxtable wrote:
    > But the basis of the original enquiry was to the common confusion between
    > error and correction.
    
    If unsure about whether to add or subtract a correction or error, it
    helps if you remember that the objective is to remove error from the
    observation. Remove = subtract. Then it follows that a correction is added.
    
    This same memory aid will help if you have the number and know what to
    do with it, but can't remember the correct name. For instance, after a
    sight to check index error, the micrometer reads 58.8'. To put the
    reading right you add 1.2' or subtract -1.2'. The second value is what
    you remove, so it's the error, and the first value is the correction.
    
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