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A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Instrument Corrections
From: Glendon
Date: 2003 Mar 10, 11:31 +1100
From: Glendon
Date: 2003 Mar 10, 11:31 +1100
The certificate to my 1974 Heath Hezzanith states: "The following corrections, in addition to Index correction should be applied to the readings of the arc" .... i.e. the (few) numbers shown ( maximum of +0.2') are corrections, not errors. My 1988 Russian SNO-T has no certificate of error/corrections....as best I can interpret the (Russian) instructions, the implication is that the instrument has been manufactured to a standard where there are no instrument errors of practical significance, and that Index errors should be corrected for in the usual way. I have often wondered whether this is true!! Lee Martin ----- Original Message ----- From: "Bruce Stark"To: Sent: Monday, March 10, 2003 6:04 AM Subject: Re: Instrument Corrections > Fred, > > I haven't used many different sextants, but feel reasonably confident the > maker of yours would know the difference between "correction" and "error." So > if the certificate says "correction," apply it with the sign given. That > worked for me when taking lunars using a sextant with certificate errors up > to 1.'0 of arc. > > Perhaps some certificates do give it as "error" and show the + or - > accordingly. I'd like to know. > > Bruce