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This compass was purchased in 2003 on eBay for the purpose of carrying with me during geocaching.
Specifications:
- Manufacturer: Cammenga
- Date of Manufacture: 2003
- Materials:
- Body: Cast aluminum, enameled Olive Drab
- Crystal: plastic
- Capsule: plastic
- Needle: Plastic card
- Magnet: AlNiCo
- Damping: liquid
- Pivot: Sapphire Jewelled bearing
- Graduations: 360 degrees by 5, 6400 mils by 100.
- Weight: 5.6 oz.
- Stop: Activated by closing lens.
- Other: Tritium capsules provide illumination with no light source required.. To demonstrate the difference between modern illuminated compasses and older models which used Radium, I tried to get the GM-10 to register any radiation coming from this compass, and was unable to. In fact, the aluminum case appeared to cause the background radiation from elsewhere in the room to drop a couple of points.
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