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2. Goniometer - Wikipedia

   en.wikipedia.org/wiki/Goniometer

   A half-circle protractor marked in degrees (180°). A protractor is a measuring instrument, typically made of transparent plastic, for measuring angles. Some protractors are simple half-discs or full circles. More advanced protractors, such as the bevel protractor, have one or two swinging arms, which can be used to help measure the angle.

3. Compass - Wikipedia

   en.wikipedia.org/wiki/Compass

   A magnetic card compass is usually equipped with an optical, lensatic, or prismatic sight, which allows the user to read the bearing or azimuth off the compass card while simultaneously aligning the compass with the objective (see photo). Magnetic card compass designs normally require a separate protractor tool in order to take bearings ...

4. History of the compass - Wikipedia

   en.wikipedia.org/wiki/History_of_the_compass

   It combined a compass with a protractor built into the base. His design featured a metal compass capsule containing a magnetic needle with orienting marks mounted into a transparent protractor baseplate with a lubber line (later called a direction of travel indicator). By rotating the capsule to align the needle with the orienting marks, the ...

5. Compass (drawing tool) - Wikipedia

   en.wikipedia.org/wiki/Compass_(drawing_tool)

   A beam compass and a regular compass Using a compass A compass with an extension accessory for larger circles A bow compass capable of drawing the smallest possible circles. A compass, also commonly known as a pair of compasses, is a technical drawing instrument that can be used for inscribing circles or arcs.

6. Straightedge and compass construction - Wikipedia

   en.wikipedia.org/wiki/Straightedge_and_compass...

   The "straightedge" and "compass" of straightedge-and-compass constructions are idealized versions of real-world rulers and compasses. The straightedge is an infinitely long edge with no markings on it. It can only be used to draw a line segment between two points, or to extend an existing line segment.

7. Navigational instrument - Wikipedia

   en.wikipedia.org/wiki/Navigational_instrument

   Bearing compass used to determine magnetic bearings of landmarks, other ships or celestial bodies. Magnetic compass used to determine the magnetic heading of the ship. Timekeeping

8. Silva compass - Wikipedia

   en.wikipedia.org/wiki/Silva_compass

   Silva Field baseplate compass on a map. Silva Sweden AB is an outdoors products company that sells handheld compasses and other navigational equipment including GPS tools, mapping software, aircraft altimeters, and marine navigation tools.

9. Mercator projection - Wikipedia

   en.wikipedia.org/wiki/Mercator_projection

   The Mercator projection in normal aspect maps trajectories of constant bearing (called rhumb lines or loxodromes) on a sphere to straight lines on the map, and is thus uniquely suited to marine navigation: courses and bearings are measured using a compass rose or protractor, and the corresponding directions are easily transferred from point to ...