A compass is used to determine direction on the surface of the earth. The most common type of compass is the magnetic compass, that relies on the Earth’s magnetic field
It’s use is for navigation
Well as a surveyor I have a good idea about compasses and there uses.
Read more aboutCompasses
They have been used for land survey since the beginning, the use of bearing and quadrants ( NE, SE, SW, and NW ) has always been a part of surveying. A bearing is broken down in to four quadrants of each quadrants have 0 to 90 degree angels. These angles are broken down as such, degrees, minutes, and seconds. There are 360 degrees in a circle, in between each degree there 60 minutes and between each minute there are 60 seconds. As you can see it is broken down to small amounts. So a bearing is a angle that is in D.M. S a bearing let’s say in the NW quadrant would look like this ( N 30-28-48 W ) North 30 degrees, 28 minutes, 48 seconds West this is the direction of the bearing. Now note: this is a brief example.
This information is used every day for surveyors, these bearings and quadrants are taken and mathematically by trigonometry ( the use of triangle) and geometry (the use of coordinates) to figure computations for designing roads, engineering storm water , subdivisions and so on.
Also taking raw land and making it into something such as location of lots that are described in deeds. And are recorded in and deed form and plats. They all have started from a land surveyor that uses bearings.
Also a azimuth is the total angle when sighting from one point to the forward point as to the bearing of the back site point. This again can be broken down or configured to a bearing.
Compasses are a very important part not only for a surveyor it is used also by the military that help keep one on a direction and to mark a target by placing a coordinate on the target this is achieved by a bearing and distance. Either calculated by hand or now a days electronically.
Compasses have been used for directions from North and if you have a map that is related to North and once you have a starting place ( your location matches a mapped point from there you can go into a direction that will lead you to the desire location. Of course with GPS that is used today is a signal from satellites to the user that places a coordinate on your location again it is figuring by calculation (Bearings – distant converted to coordinates)
For campers and hikers and hunters and fishing when going on to land to find your location and were you want to go and how to get back a compass will take you there. If you GPS unit stops working for whatever reason such batteries died the good old compass works well also if your in a heavy wood area the GPS unit will not work the tree cover will block the signal from the above satellites. Therefore a compass becomes more valuable.
Here are so examples of products with pictures and description of compasses.
Lensatic Compass – Phosphorescent
The phosphorescent lensatic compass has been used as an economical alternative to the tritium model for decades. It is the same compass Cammenga has been supplying to the US military except that the self-luminous tritium has been replaced with phosphorescent paint. Features of this most rugged and accurate compass are: Luminosity: phosphorescent Jewel bearing: sapphire Rotating Bezel: bi-directional Climate capacity: -50 to+150 degrees F. Frame Materials: cast aluminum Lanyard: Included Waterproof: yes Carrying Pouch: LC-1 pouch with belt clip Condition: new Expected luminous life: 1-2 hours after brief exposure to light Accuracy: per MIL-PRF-10436N Dial readings: degrees and mils. Casting: aluminum Damping process: induction (no liquid required) Color, body: olive drab Color, pouch: olive drab.
Lensatic Compass – Phosphorescent
The Phosphorescent Lensatic Compass is built to the demanding specification MIL-PRF-10436N. Battle tested through rigorous shock, water, sand proof, and functional from -50 F to +150 F.
The phosphorescent lensatic compass has been used as an economical alternative to the tritium model for decades. It is the same compass Cammenga has been supplying to the US military except that the self-luminous tritium has been replaced with phosphorescent paint.
Equipped with a magnifying lens, sight wire, and dial graduations in both degrees and mils to ensure accurate readings. The Copper Induction Damping System slow the rotation of the magnet without the use of liquids. Built to last with an aluminum frame and waterproof housing. The Cammenga Compass is depended on by fighting forces, government agencies, and adventurous outdoor enthusiasts around the world.