Which of the following is a component of a lensatic compass, according to the listed parts?

• A. Sighting Slot
• B. Magnetic field coil
• C. Altimeter
• D. Antenna shaft

Answer: (A)

The lensatic compass relies on a sighting mechanism to accurately transfer a distant line of travel to the compass card. The sighting slot is the precise feature used to line up a distant object with the compass. When you open the cover, you view through the sighting lens and align the object with the slot, allowing the azimuth to be read on the dial. This setup is what makes a lensatic compass accurate for navigation.

The other items don’t fit as parts of this instrument: a magnetic field coil would be found in electronic or specialized devices, an altimeter measures elevation rather than directional bearing, and an antenna shaft isn’t a component of a traditional lensatic compass.