Multi-Function - This professional grade military dash altimeter compass will always guide you in the right direction. Suitable for car, watercraft, boat, caravan and truck and wherever the beaten path takes you High Accuracy - Built-in precision compensator to easily adjust the gap, making the reading more accurate, improving its Accuracy and Reduces Error Navigation Compass - Easy to install, visible lubricant line for easy reading of direction. The compass pointing direction is the same with the direction of the vehicles.Made of high quality materials, waterproof, corrosion resistant Bracket design - Bracket mounted compass, can be mounted on the deck or dashboard; allows the compass to stay at the correct viewing angle. Mid-size support bracket, more stable for navigation course changes Great Balance & Portable - The car gyroscope compass owned fast response, high sensitivity, keep balance individually, precision engineering reading display. Compact in size, this compass is very portable and easy to set up or use