Translations:Adventist Youth Honors Answer Book/Recreation/Orienteering (General Conference)/8/en

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c. Lens
The lens is used to read the dial, and it contains the rear-sight slot used in conjunction with the front for sighting on objects. The rear sight also serves as a lock and clamps the dial when closed for its protection. The rear sight must be opened more than 45° to allow the dial to float freely.
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