| http://www.w3.org/ns/prov#value | - A correction apparatus for an azimuth calculation system as claimed in claim 2, wherein said means for determining first and second radii of the azimuth circle includes means for determining first and second radii as: ##EQU4## where Xj H is said X maximum value, Xj L is said X minimum value, l is an integer for defining a maximum value of Xj H -Xj L, and N is an integer for defining at least even
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