Polymath Products CMP-20 Compass Necklace. Rugged and reliable navigation aid with precision luminous dial. UK-made. by Amazon.co.uk

• A rugged and reliable navigation aid. Can be used day and night, in all weather conditions.

• Featuring a shockproof, military-grade compass; precision luminous dial, fluid-damped and built to keep working in extreme conditions.

• It can be worn easily around the neck to provide quick direction checks whilst on the move. With a lightweight and ergonomic design it can be worn at all times and is almost unnoticeable.

• Oil and seawater resistant TPU construction ensures the CMP-20 will last under field use. The ideal backup to other, larger navigation devices such as GPS or a lensatic compass, which could fail to work due to flat batteries, extreme conditions or damage.

• Size: 35mm x 27mm x 13.5mm. Cord length: 400mm loop (800mm total). Weight: 11.6g. Made in the UK by Polymath Products.