Sextant: a navigation instrument that is used to establish position by measuring the height of stars from the horizon.
Index mirror: large polished plate that reflects light.
Telescope: optical instrument made of lens that magnifies objects.
Telescope clamp: reinforcing circle.
Eyepiece: lens the user looks through.
Telescope printing: lens adjustment.
Frame: structure that serves as the base for the different parts of the sextant.
Graduated arc: graduated edge of the arc.
Locking device: apparatus that holds the sextant in place.
Drum: graduated button used to take measurements.
Index arm: type of ruler that determines direction or measures an angle.
Screw to regulate small mirror: piece of metal used to adjust the horizon mirror.
Glass filter: colored transparent substance.
Horizon mirror: small polished glass plate that reflects light.
Glass filter: colored transparent substance.

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An amphibious vehicle, is a vehicle or craft, that is a means of transport, viable on land as well as on water, just like an amphibian. This definition applies equally to any land and water transport, small or large, powered or unpowered, ranging from amphibious bicycles, ATVs, cars, buses, trucks, RVs, and military vehicles, all the way to the very largest hovercrafts. Classic landing craft are generally not considered amphibious vehicles, although they are part of amphibious assault. Nor are Ground effect vehicles, such as Ekranoplans.

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