Navigational Techniques and Tools

The video explores the evolution of ocean navigation from early methods used by Vikings and Polynesians to modern GPS technology. It discusses the use of stars, particularly Polaris, for navigation, the introduction of the magnetic compass, and the development of chronometers for accurate longitude calculation. The video concludes with a look at modern GPS systems and traditional backup methods like the sextant.

What method did Viking explorers use to determine the direction of land?

• They used a magnetic compass.

• They used the North Star.

• They followed the direction of released ravens.

• They relied on the position of the sun.

How did early Pacific Polynesians navigate between islands?

• By using a magnetic compass.

• By relying on ocean currents.

• By following migrating birds.

• By using the motion of the stars and natural indicators.

What is the North Star also known as?

• Vega

• Sirius

• Betelgeuse

• Polaris

What was the first useful invention for holding a steady direction at sea?

• The astrolabe

• The magnetic compass

• The chronometer

• The sextant

What is 'dead reckoning' in navigation?

• A method to calculate longitude using time.

• A way to measure the depth of the ocean.

• A technique to estimate ship speed and position.

• A method of using the stars to navigate.

Why is an accurate clock necessary for determining longitude?

• To compare local time with GMT.

• To calculate the ship's speed.

• To determine the ship's latitude.

• To measure the angle of the sun.

What was the main challenge with early mechanical clocks on ships?

• They were too large to be practical.

• They were not accurate enough for latitude calculations.

• They were affected by environmental conditions.

• They required constant winding.

What navigation tool is still used today as a backup to GPS?

• The astrolabe

• The magnetic compass

• The chronometer

• The sextant

What feature do many modern marine GPS units have for emergencies?

• A built-in radio

• A weather forecasting tool

• A Man Overboard button

• An automatic distress signal

How did Captain Cook contribute to the development of navigation technology?

• He demonstrated the accuracy of a chronometer.

• He invented the magnetic compass.

• He developed the first marine GPS.

• He mapped the stars for navigation.