| 摘要 |
A length measuring apparatus which is capable of calculating an actual distance by measuring length on a map and which has a display section to display the actual distance thus calculated. The length measuring apparatus includes a distance-data input switch for inputting a distance-index data of a scale-reduction scale indicated on the map and a memory for storing length of the scale-reduction scale on the map, which is measured by the rotation of a rolling member. The length measuring apparatus automatically calculated a scale-reduction value for the map from the distance-index data and the length of the scale-reduction scale stored in the memory. Accordingly, a user of the apparatus is not required to input the scale-reduction value for the map by means of keys.
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