From the Manufacturer
The Silva Trekker provides a compact sighting mirror ideal for use in the outdoors when targeting far off land marks for navigation.
If You'Re Into Backpacking, Angling Or Camping, This Lightweight Compass Is Perfect On The Trail. It Has A 4-Position Positive Stop Mirror With Vee Notch. The Rotating Capsule Has A Sure-Grip Dial, A Red Orienting Arrow And Declination Scale. Other Features Include Inch And Millimeter Rules On A Clear Base Plate For Easy Mapping And Plotting