| 摘要 |
A spatial orientation guide used to enable a person to easily, accurately, and repeatedly return to a predetermined location. The guide comprises two similarly shaped, contrasting portions each defining a similarly shaped outline on separate, adjacent planes. To set the guide for future use, a suitable location is chosen. The guide is then positioned so that the planar outlines of the portions are orthogonal to and spaced along the sight line taken from the chosen location. In this configuration, the portion closest to an observer obscures the maximum observable surface area of the portion furthest from an observer. When the person wants to return to the desired location, all that is required is that the person move relative to the now "set " guide. As a person moves toward and away from the predetermined location, the percentage of the observable surface area of the furthermost portion becomes lesser and greater, respectively. When the amount of observable surface area of the furthermost portion is at a minimum or disappears, the user is at the predetermined location.
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