Description

Silva Terra Expedition S Mirror Sighting Compass

The Silva Terra Expedition S is a precision mirror sighting compass developed for experienced navigators, outdoor professionals and demanding expeditions. Its sighting mirror allows the user to align a distant landmark while simultaneously monitoring the compass dial, helping produce accurate bearings across open terrain.

This Terra version uses recycled polymers and hemp-based REVO material for selected components while retaining the practical navigation features of the Expedition series.

Key Features

• Mirror sighting system with sighting hole for accurate bearings
• Built-in permanent magnetic declination adjustment
• Clinometer for measuring slope angles
• 45-degree angle assistance on the mirror
• Accuracy of 1°
• Magnifying lens for detailed map reading
• Luminous markings for navigation in low-light conditions
• Rubber grip and friction feet for stable map work
• Waterproof and made to withstand demanding outdoor use
• Detachable safety-release distance lanyard

Precise Mirror Sighting

The mirror makes it possible to observe the compass dial and the selected landmark at the same time. This is particularly useful when taking bearings over longer distances, where small alignment errors can significantly affect the final route.

Map Work and Distance Measurement

The baseplate includes millimetre, inch, 1:25,000, 1:50,000 and GPS measuring scales. A magnifying lens assists with fine map details, while rubber friction feet help keep the compass steady on the map.

The detachable recycled-PET lanyard is flexible enough to follow curved routes and includes 1:25 and 1:50 distance scales for compatible maps.

Declination and Slope Measurement

A built-in adjuster allows permanent compensation for local magnetic declination. The integrated clinometer can be used to estimate slope angles when assessing terrain, route difficulty or potential hazards.

Lower-Impact Material Choice

The lid, grip ring and graduation ring are made from REVO, a material combining recycled polymers with hemp fibres. According to Silva, REVO can generate up to 90% lower carbon emissions than ordinary plastic. This comparison applies to the material rather than the complete lifecycle of the compass.

Technical Specifications

Basic Sighting Procedure

1. Confirm and set the correct local magnetic declination.
2. Open the mirror and sight the compass towards the selected landmark.
3. Rotate the housing until the magnetic needle aligns with the orienting markings.
4. Read the bearing and transfer it to the map if required.

Care and Safety

• Keep the compass away from magnets, speakers, vehicles, steel structures and electronic devices while taking a bearing.
• Verify local magnetic declination before navigation, as it changes by location and over time.
• Charge the luminous markings under a light source before night use.
• Rinse off salt or dirt with fresh water and allow the compass to dry before storage.
• Carry a map and a secondary navigation method on remote or safety-critical journeys.

Frequently Asked Questions

Is the Silva Terra Expedition S a global compass?

No. SKU 38243 is identified as the Magnetic North version. Check that it is suitable for the magnetic zone in which it will be used.

Can magnetic declination be adjusted?

Yes. The compass has a built-in permanent adjuster for compensating for local magnetic declination.

What is the clinometer used for?

The clinometer measures slope angles and can assist with terrain assessment, route planning and estimating gradients.

Is the compass waterproof?

Silva specifies the Terra Expedition S as waterproof. It should still be protected from heavy impact, extreme heat and prolonged exposure to chemicals.

What makes the Terra version more sustainable?

Selected components use REVO, which combines recycled polymers and hemp fibres. Silva states that this material can have up to 90% lower carbon emissions than ordinary plastic.

Glossary

Bearing

The direction from one position to another, expressed in degrees.

Magnetic declination

The angle between magnetic north and true north at a particular location.

Clinometer

An instrument used to measure the angle or steepness of a slope.

Mirror sighting

A system that allows the compass dial and a distant landmark to be viewed simultaneously.

GPS scale

A baseplate scale used for plotting or reading map coordinates.

Manufacturer and GPSR Information

Manufacturer and EU responsible economic operator:
Primus-Silva Sweden AB
Mariehällsvägen 37A
168 65 Bromma
Sweden

Contact:
Email: This email address is being protected from spambots. You need JavaScript enabled to view it.
Telephone: +46 8 623 43 00
Customer service: Silva Customer Service