instrument history

Question 1

Automatic radar plotting aide (ARPA)

Answer 1

they display the position of a ship and other vessels nearby

Question 2

automatic tracking aid

Answer 2

display information on tracked targets to create a planned layout for a safe course

Question 3

echo sounder

Answer 3

measures the water’s depth below a ship using sound waves

Question 4

GPS

Answer 4

introduced in the late 1990s, positioning signals come from satellites

Question 5

Gyroscopic Compass

Answer 5

introduced in 1907, will always point to the true north regardless of the magnetic field

Question 6

Long Range Tracking and Identification System

Answer 6

(LRIT) thorough tracking system for ships around the world

Question 7

Long Range Navigation

Answer 7

(LORAN) developed in the 1940s, decommissioned in 2010. Determined a ships position through pulsed radio transmissions

Question 8

Radio Detection and Ranging

Answer 8

(RADAR) radar sends out radio waves and detects any reflection. Useful in locating ships