Tabletop 3

Written Test Review and Navigation

1) Review test and Discuss answers

2) Navigation

a) WINDS Wind: Movement of air mass across the earth’s surface, expressed in direction FROM.

· True Wind: Enroute winds from forecaster are TRUE from Winds-Aloft charts and Teletype Winds-Aloft Forecasts.

· Magnetic Winds: Surface winds from Airport Traffic Control and Approach/Departure Control are MAG winds, and coincide with MAG direction of runways.

b) Conversion of True and Magnetic Winds

To convert wind direction from degrees with respect to true north to degrees with respect to magnetic north, or vice versa, the observer shall obtain the local magnetic variation from an aeronautical chart and proceed as follows:

1)  To convert from true to magnetic wind:

(a)  Add westerly variation to true direction (West is Best)

(b)  Subtract easterly variation from true direction

2)  To convert from magnetic to true direction:

(a)  Add easterly variation to magnetic direction

(b)  Subtract westerly variation from magnetic direction (West is Least)

Examples:

A) ABQ Airport, the magnetic variation is 10º East. The local wind indicator is reading 250º (magnetic). When transmitting the wind direction in an observation, because the magnetic variation is 10º East, the observer should add 10º to transmit a direction of 260º (true).

B) We are flying from Santa Anna and some kind person has converted the wind direction to true. The wind is at 310 true @ 4.5 knots. Where will we be in 1 hour assuming the wind stays constant?

C) We are again flying from Santa Anna again and now the wind is 289 (magnetic) @ 4.5 knots. Where will we be in 1 hour assuming the wind stays constant?

D) We are for the third day in a row flying from Santa Anna in a heading of 119.30. Where will we be in one hour if the wind continues to blow at 4.5 knots.