The sonar technician happily answers your questions about working as a sonar technician. You're suitably impressed by the job.
1. What is the difference between active and passive sonar?
Active sonar uses signals sent out from the ship, and listens for the returning signal (or ping) to locate a submerged target. Passive sonar only listens to sounds made by other ships in the water.
2. What do speed log systems measure?
The speed log system measures the speed of the ship moving through the water.
3. What does "alongside" mean?
Alongside means that a ship is in port, as opposed to being out at sea.
4. Are a sonar technician's days usually longer in port or at sea?
A sonar technician's working hours are usually much longer when he's at sea, as opposed to being in port.