| 摘要 |
A hand-held navigational tool including one or more maps, preferably in the form of photograhic transparencies, releasably mounted upon a base for viewing through an opening in the base and rotatable about the center of the opening relative to course bearing indicia carried on a transparent graticule which is superposed with the viewed portion of the map. The viewer is carried on a member movably linearly in any direction in a plane parallel to that of the map to allow magnified viewing of a portion of the map while permitting visual excursion over the entire map. A compass, relative distance scales, map illumination means and selectively operable means for scribing a course line in the map holder or rotating the viewed portion of the map about a fixed point are all additional features which may be incorporated in the unit.
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