The Silva Expedition 54B 6400-6400/360 Military Compass is the top of the range in hand-held military compasses.
The Expedition 54 is a unique compass featuring graduations in Mils*, an optical precision sighting system and a SILVA 1-2-3 SYSTEM compass in the same unit, giving unbeatable precision and versatility in the field. Bearings can be taken with accuracy to within half a degree – 6400 mils on the graduation ring and 6400 mils and 360 degrees on the sighting scale.
The Silva Expedition 54B 6400-6400/360 Military Compass features Beta illumination which lasts for 7.5 years and does not require light activation, whereas the other Silva military compasses have a light activated luminous compound which illuminates up to 4 hours.
Features & Specifications:
- MS – optimised for magnetic south zone (Australia & New Zealand)
- Special “Beta Illumination” illuminates for 7.5 years after activated
- Luminous compound: Tritium compound 80 mCi
- Available graduations: 6400/360
- Resolution degrees / mils: Outer ring: 2 / 50
- Precision sighting scale: 1 / 20
- Measuring scales on base plate: 1:25k, 1:50k, 1:40k, mm, inch
- UTM position plotting scales (Romer scales): 1:25k, 1:50k, 1:40k
- Settling time from 90 degree angle within +/- 3 deg: 4 sec
- Settling time from 90 degree angle to complete rest: 6 sec
- Accuracy: +/- 0,5 degree (8,9 mils)
- Waterproof: IP68 – (10 m)
- Altitude use: 5000m@-15 C I
- Impact resistance: 30g in XYZ directions and free fall from 1.5 m height into gravel
- Temperature operating range: -40 to +60 C
- Material: Acrylic
- Size (mm): 126x60x16
- Weight: 39 grams
A milliradian (mil) is an SI derived unit for angular measurement, defined as a thousandth of a radian (0.001 radian).
Compasses graduated in Milliradians are generally used where very small angles are necessary for very accurate calculation of proportions, size and distance of a target, for example for rifle and short distance artillery purposes.
A military compass is generally not suited for standard navigation for hikers, orienteers etc. where degrees are used to navigate.