Silva Expedition 4

Features:

Measuring scales for positioning (GPS)

Graduated in miles and degrees ( 6400/360)

Magnifying glass

Rubber feet for precision map work

Gives light for up to 4 hours - luminated by daylight/ flashlight etc. 

Specifications 

Accuracy- +/- 1° (17.8 miles)

Altitude use: 5000m @ -15°C

Clinometer- No

Declination adjustment- Declination scale inside capsule

Graduation- 6400°/360° (360° inside the capsule), 6300°, 360°

Illumination- 4 hours after activation in light

Impact resistance- 30g in XYZ directions and free fall from 1.5m height into gravel

Magnifying lens- Yes

Material- Acrylic

Patented red/black N/S lines in capsules- Yes

Resolution degrees / miles- 2 / 50

Scales- mm, inch 

Settling time from 90° angle to complete rest- 5 sec

Settling time from 90° angle within +/- 3°- 2.7 sec

Sighting System- No

Silicon friction feet- Yes

Size- 126 x 60 x 10 mm

Temperature operating range- -40 to +60°C

Type of compass- Silva 1-2-3 Systwem baseplate compass

UTM position plotting scales (Romer scales)- 1:25k, 1:40k, 1:50k

Water vresistance- IP68 - (more than 100m)

Weight- 36 grams