Multimedia Gallery
The UAT and similar transceivers are what make ADS-B possible.
Satellite navigation is creating significant changes in the infrastructure of air navigation and air traffic control.
Length: 43 Minutes, 51 Seconds
Using a compass, depicted by Flemish artist Jan van der Straet, 1523-1605.
A mariner could use a cross staff to measure the Sun’s angle above the horizon at midday.
A lead line could measure water depth and bring up a sample of the bottom.
Using a mariner's astrolabe to measure the angle of the Sun or a star above the horizontal.
A nocturnal is used to find the local time at night by observation of stars near the North Pole.
Sandglasses of different sizes and durations could measure intervals of time for ship speed and periods of duty.
Using an horary quadrant to find time of day by measuring the Sun's altitude.
