| 摘要 |
Navigational calculator, characterised in that it comprises: - a base (1) provided with a fixed gauge (5), - a first scale, termed the heading scale, graduated in angle measurement units, carried by the base and movable with respect to this base in such a way as to present a given angular value opposite the gauge of the base, - at least one second scale, termed the correction scale, graduated in angle measurement units, carried by the base and movable with respect to this base in such a way as to present a given angular value, positive or negative, opposite the gauge of the base, the second scale being provided with a gauge (19) allowing the origin of its angular values to be made to coincide with the fixed gauge (5) of the base, - first means making it possible to lock the first scale with respect to the base, - second means making it possible to render the first and the second scale integral with one another. <IMAGE>
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