Silva 55 MILITARY COMPASS

SILVA 55-6400/360 military compass – southern hemisphere (MS) model, 5 year warranty.  *Free delivery within Australia (standard parcel post).

The SILVA 55 military compass features graduations in Mils*, an optical sighting system and the SILVA 1-2-3 system in the same unit.

The compass has a luminous graduation ring and markings for use in the dark, which when activated by daylight/flashlight will give up to 4 hours of luminescence.
The compass capsule is marked with 6400 mils on the graduation ring and 6400 mils + 360 degrees on the sighting scale.

Features:

• Type: SILVA 1-2-3 System, baseplate compass
• Lensatic sighting system
• Liquid filled capsule
• Sapphire jewel bearing
• High quality steel needle
• Hardened steel pivot
• Magnifying lens: Yes
• Luminous graduation ring: Yes
• Illumination / active time after activation in light: 4 hours
• Silicon friction feet: Yes
• Patented red/black N/S lines in capsule
• GPS scales
• Scale lanyard (1:25, 1:50)
• Slope card
• Southern hemisphere (MS) model

SILVA 55 military compass technical specifications:

• Graduation Outer ring: 6400 mils
• Sighting scale: 6400/360
• Resolution degrees / mils Outer ring: – / 50
• Sighting scale: 1 / 20
• Measuring scales Base plate: 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)
• Water resistance: Waterproof
• Altitude use: 5000m@-15 C
• Impact resistance: 30g in X YZ directions and free fall from 1.5 m height into gravel
• Temperature operating range: -30 to +60 C
• Material: Acrylic
• Size (mm): 126 x 60 x 16
• Weight:  39 grams
• 5 year warranty against defects in manufacture or materials

*Graduations in Mils (Milliradians):

Mils compasses are divided into 6400 divisions rather than the standard 360 degrees. Mils compasses are largely used by the military for calculation of range and scale – for example two objects that appear to be 100mils apart and are 1000m away from the observer are around 100m apart on the ground.