Previously, she worked as a PADI scuba instructor, diving with sharks at Aliwal Shoal near Durban. Jessica Macdonald lives in South Africa's Eastern Cape province, where she has honed her skills as a freelance writer specializing in travel, scuba diving, and wildlife conservation. On top of that, Earth's magnetic north changes and even varies geographically, which can interfere with a compass' accuracy. However, it's important to keep in mind that there's a difference between magnetic north and the geographic North Pole. If you know what direction north is, you can adequately orient yourself and go about your travels. A compass has a magnetized needle, and the north end of that needle is attracted to the north pole of Earth's magnetic field. The magnetic field arises from motion in the liquid outer core. At the center of the Earth is an iron core that is part liquid and part solid.
Those who like the idea of navigating by the stars can use the app’s star charts, while a sun, moon, and star finder come in handy for romantics searching for specific constellations.Ī compass works by detecting Earth's magnetic fields. Essentially, it works just like the GPS in your car. When traveling to a waypoint, the app tells you the distance to your destination, direction, traveling speed, and estimated arrival time. You can also use the app to mark customized waypoints and navigate back to them later. Other handy features include a horizontal and vertical speedometer, an altimeter, and a gyro horizon calculator that tells you your orientation in relation to the Earth’s horizon. It also acts as a gyrocompass for finding true north and as a GPS receiver. In conventional compass mode, it can be used with different map backgrounds to give an idea of what lies ahead.
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IPhone users who like the idea of a more complex offline app will love the free Commander Compass Go app. These compasses are right or left-hand specific. On the bottom of the baseplate, rubber friction feet help to prevent slippage. It’s also shaped for excellent contact between your thumb and the map. The minimalist, ultra-transparent design increases map visibility, while the thickness of the baseplate makes it capable of withstanding an active lifestyle.
The capsule’s small size means it’s less susceptible to volume changes due to extreme temperatures and, therefore, less prone to bubble formation. The 360-degree turnable capsule houses a jet needle that settles in record time-crucial in a race when every second counts. It offers impressive stability so that even when you’re cycling or running over rough ground, your reading remains accurate to +/- 1 degree. The Silva Race 360 Jet Compass tips the scales at just 1 ounce, keeping your overall weight to a minimum. Thumb compasses are designed with competitive athletes in mind and fix onto your thumb, leaving your other hand free. Other dive-specific features include a glove-compatible ratchet bezel and an extra-long strap that fits over your wetsuit. On night dives, charge the display with your flashlight for optimum visibility. The compass also has a luminescent display, which glows approximately seven times faster and longer than other materials. A bright red lubber line indicates your direction of travel. The bearing indicators are large and easy to read, while direct and reciprocal index points are handy for swimming out and back on the same heading. A side window allows you to view bearings while keeping the compass level on your extended wrist. This design compensates for your movement and the motion caused by surge and current, making it much easier to read. Instead of a free-spinning needle, the compass features a printed card that floats in liquid and rotates according to your orientation.
It’s waterproof, saltwater-resistant, and capable of withstanding increased pressures at depth. The Oceanic Wrist Mount Compass is purpose-built for scuba diving.
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