| 摘要 |
Navigational apparatus for use in a mobile craft comprises measuring means for providing electrical representations of two coordinates of the two position of the mobile craft relative to a hyperbolic navigation system, a data store for holding representations of sets of constants, selection means for selecting one of the sets, and a computer for calculating given functions of the measured coordinates and the selected constants to produce useful approximate indications of the latitude and longitude of the mobile craft. The functions may be a pair of polynomials of the second degree, each having five constants, so that there will be 10 constants in each set.
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