---
product_id: 48190692
title: "CMP-20 Compass Necklace. Rugged and reliable navigation aid with precision luminous dial. UK-made."
brand: "polymath products"
price: "Rp512315"
currency: IDR
in_stock: true
reviews_count: 8
category: "Polymath Products"
url: https://www.desertcart.id/products/48190692-cmp-20-compass-necklace-rugged-and-reliable-navigation-aid-precision
store_origin: ID
region: Indonesia
---

# Shockproof military-grade build Precision luminous dial Oil & seawater resistant TPU CMP-20 Compass Necklace. Rugged and reliable navigation aid with precision luminous dial. UK-made.

**Brand:** polymath products
**Price:** Rp512315
**Availability:** ✅ In Stock

## Summary

> 🧭 Navigate with confidence, wherever life takes you.

## Quick Answers

- **What is this?** CMP-20 Compass Necklace. Rugged and reliable navigation aid with precision luminous dial. UK-made. by polymath products
- **How much does it cost?** Rp512315 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.id](https://www.desertcart.id/products/48190692-cmp-20-compass-necklace-rugged-and-reliable-navigation-aid-precision)

## Best For

- polymath products enthusiasts

## Why This Product

- Trusted polymath products brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Compact Yet Powerful:** Small 35x27x13.5mm size packs precision navigation without weighing you down.
- • **Effortless Wearability:** Lightweight (11.6g) and ergonomic, designed for all-day comfort around your neck or gear.
- • **Built to Brave Extremes:** Military-grade shockproof design and fluid-damped needle ensure accuracy under pressure.
- • **Weatherproof Durability:** Oil and seawater resistant TPU construction means it thrives in rain, sea spray, or mud.
- • **Reliable Navigation Anytime:** Stay on course day or night with a glow-in-the-dark dial that recharges in seconds.

## Overview

The CMP-20 Compass Necklace is a UK-made, compact, and rugged navigation tool featuring a shockproof, fluid-damped military-grade compass with a precision luminous dial. Designed for all-weather use, it is oil and seawater resistant, lightweight at just 11.6g, and ergonomically crafted for comfortable daily wear. Ideal as a reliable backup to electronic devices, it ensures you never lose your way, day or night.

## Description

The CMP-20 Compass Necklace is a compact navigation accessory that is designed to keep working when other devices may have failed. Due to its small size, low weight and rounded ergonomic design it can be comfortably carried at all times.It is ideal for daily wear around the neck, or alternatively it can be attached to your hiking rucksack or jacket; either way it is ideally placed for making quick checks of heading, to make sure you are not off-course.Very accurate for its size, the 20mm diameter compass was specially designed and is a far cry from many other 'button' compasses available. It is tough, shockproof, and built to last.Equally capable of both day and night navigation thanks to the very best in photoluminescent GITD (glow-in-the-dark) material. The compass is easily readable in the dark, and just a few seconds of light from a flashlight will 'recharge' it.The CMP-20 is extremely durable, with oil and seawater resistant construction. It can be used underwater and at extreme altitudes.CMP-20 dimensions: 35mm x 27mm x 13.5mm. Cord length: 400mm loop (800mm total). Weight: 11.6g.Product for use by adults only, or under close adult supervision.

Review: The perfect backup compass. - While I certainly won't be using this compass as my main navigator, it is a brilliant emergency backup, or something to use for frequent bearing checks. Rather than being a cheap, poor quality novelty, this little CMP-20 Compass Necklace is actually a well-made, quality little instrument. The dial is surprisingly easy to read, given it's tiny dimensions. The fluid-damped dial spins freely, and is very accurate. The luminous paint works very well and you could definitely read this compass at night. It's not going to replace my Silva 4 Militaire. But it is a worthy addition to any backpack, or just to wear on a day in the countryside as a 'just-in-case'. Recommended.
Review: Nice bit of kit - While this maybe small it is a cracking compass, nice and sturdy, lightweight and very accurate. I don't need anything more complicated as I only needed it for my campervan to make sure I park with the nearside of the vehicle facing south. That way we will get the afternoon and early evening sun flooding into the area outside of our awning setup. The glow in the dark face is a nice touch which may be useful if we turn up to a site after dark, quick charge under the headlights and bingo.

## Features

- 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. Features a safety breakaway fitting.
- 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.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B076CRZD1B |
| Batteries included? | No |
| Best Sellers Rank | 13,291 in Sports & Outdoors ( See Top 100 in Sports & Outdoors ) 18 in Compasses (Sports & Outdoors) |
| Customer Reviews | 4.5 4.5 out of 5 stars (290) |
| Date First Available | 10 Oct. 2017 |
| Features | Compact, Lightweight, Shakeproof |
| Is discontinued by manufacturer | No |
| Manufacturer | Polymath Products |
| Manufacturer reference | PPCMP20 |
| Material type | Plastic |
| Product Dimensions | 3.5 x 1.35 x 2.7 cm; 11.6 g |

## Product Details

- **Brand:** Polymath Products
- **Item weight:** 11.6 Grams
- **Material:** Plastic
- **Product dimensions:** 35L x 27W millimetres
- **Special feature:** Compact, Lightweight, Shakeproof

## Images

![CMP-20 Compass Necklace. Rugged and reliable navigation aid with precision luminous dial. UK-made. - Image 1](https://m.media-amazon.com/images/I/81X-2-IpQeL.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ The perfect backup compass.
*by G***S on 29 April 2024*

While I certainly won't be using this compass as my main navigator, it is a brilliant emergency backup, or something to use for frequent bearing checks. Rather than being a cheap, poor quality novelty, this little CMP-20 Compass Necklace is actually a well-made, quality little instrument. The dial is surprisingly easy to read, given it's tiny dimensions. The fluid-damped dial spins freely, and is very accurate. The luminous paint works very well and you could definitely read this compass at night. It's not going to replace my Silva 4 Militaire. But it is a worthy addition to any backpack, or just to wear on a day in the countryside as a 'just-in-case'. Recommended.

### ⭐⭐⭐⭐⭐ Nice bit of kit
*by A***T on 23 May 2025*

While this maybe small it is a cracking compass, nice and sturdy, lightweight and very accurate. I don't need anything more complicated as I only needed it for my campervan to make sure I park with the nearside of the vehicle facing south. That way we will get the afternoon and early evening sun flooding into the area outside of our awning setup. The glow in the dark face is a nice touch which may be useful if we turn up to a site after dark, quick charge under the headlights and bingo.

### ⭐⭐⭐⭐ Polymath CMP-20 pendant compass - handy, decent illumination in dark, uk made, would recommend
*by R***9 on 28 June 2022*

Looking at various button size compasses as backups, turned out a good choice. Pros. Good size, handy adjustable pendant cored, once ‘charged’ by torch or other bright light, stays luminous for hour plus, whole face lights up (apposed to the N, S, E & W text) & UK made. Cons. Bit harsh maybe, but if you do happen to snap pendant cored, it’s moulded into the body, you can’t replace it, thus 4 stars. Would buy again & recommend.

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*Product available on Desertcart Indonesia*
*Store origin: ID*
*Last updated: 2026-03-03*