The term "compass card" refers to a tool used in navigation, indicating the directions on a circular card marked with the points of the compass. The correct spelling of the word "compass" is /ˈkʌmpəs/, with stress on the first syllable. The spelling of "card" is /kɑːd/. Therefore, the IPA phonetic transcription for "compass card" is /ˈkʌmpəs kɑːd/. This combination of two simple words brings a tool without which navigation would remain impossible in the absence of modern technology.
A compass card refers to a navigational instrument widely used in maritime and aviation sectors, as well as by outdoor enthusiasts, to determine direction. It consists of a circular card, usually made of lightweight material like plastic or glass, which is mounted on a rotating base. The card is marked with the cardinal points of north, south, east, and west, and the subdivisions in between.
The compass card typically features additional markings such as degrees, which enable users to determine specific bearings or angles. It is also accompanied by a needle or a magnetized indicator, known as a compass needle, which aligns itself with the Earth's magnetic field. This allows the user to ascertain their heading and navigate accurately.
The compass card's design incorporates various features for ease of use and accuracy. These include a directional arrow, known as a lubber line, which enables the user to align the compass correctly with their desired direction. Moreover, the card is surrounded by a rotating bezel or ring, often called a compass rose, which can be rotated to align it with the desired heading or bearing. This enables users to calculate the difference between their current heading and the desired heading, a crucial skill for navigation.
Overall, a compass card is an essential tool for navigation, providing a reliable and straightforward means of determining direction. It is vital in various settings where precise navigation and orienteering are required, such as on ships, airplanes, while hiking, or during other outdoor activities.
The etymology of the term "compass card" traces back to the Middle English word "compas", which originated from the Old French term "compas" meaning "circle" or "compass". This Old French word, in turn, has its roots in the Latin word "circumpassus", which signifies "a circle of a compass". Over time, "compass" came to refer specifically to the instrument used for navigation, and "card" was added to describe the circular chart or card on the compass that marked the points of direction. Thus, "compass card" emerged as a term to describe the circular chart or card on a compass indicating the cardinal and intermediate points of direction.