Navigation Terminology Flashcards
What is a nautical mile? How many meters is it roughly?
How does it differ to a statute mile?
- Equal to the distance covered by 1 minute of latitude on the surface of the earth, measured along a meridian of longitude.
- 1852m
- Statue mike is shorter than a nm
How many nautical miles per hour is a knot?
Standard unit of airspeed
What is the difference between IAS, CAS, EAS, TAS and ground speed?
.
What is a vector?
Magnitude and direction
When is degrees magnetic used for surface winds?
Direction of the surface wind which is given in ATIS reports
When is degrees true used for wind?
Nav planning and most weather forecasts
What is heading ? Why is used to represent it on a graph?
- Longitudinal à orientation of the aircraft with respect to degrees true or magnetic.
- Represented by a single arrowhead.
What is ground track? What is used to depict it on a graph?
- Path of the aircraft over the surface of the earth.
- expresses in degrees true of magnetic.
- represented by double arrow line
What is drift?
The angle between the heading and the ground track.
What is bearing?
- Angular direction of a distant point from a selected datum.
What is variation?
Angular difference between the direction of true north and magnetic north at any given point on earth.
What is ETA?
Estimated time of arrival.
What is estimated time interval?
The time calculated during flight planning as being required to complete any leg or stage of a flight.
What is estimated elapsed time ?
The estimated time required to proceed from one significant point to another.
What is ETD?
- Estimated time of departure.
What is ATD?
Actual time of departure.
What is time overhead?
Time overhead. Significant point such as destination airfield a bag aid turn point waypoint or target.
Why is dead reckoning (DR)?
A method of navigation by which the position of an aircraft is calculated by the pilot using a previously known position then applying the actual direction and speed of travel in the intervening period since that position.
What is a landmark?
A chosen feature that is preferably unique to its surroundings that can be plotted to give guidance of:
- time
- left or right of a track
- used as a turning point
What is pinpoint?
Determination of the aircrafts postion by visual observation of the a/c above a point in the ground, identified by map reading.
What is a fix?
A determination of the aircrafts actual position obtained by any means other than a visual observation.
What is a waypoint?
A point used for navigation but not makes by a physical radio beacon.
What is Top of Climb (TOPC)?
Calculated point of transition from climb phase to the cruise phase.
What is Top of Descent?
Calculated point where descent is to be commenced and represents the transition from the cruise phase of a flight to the descent phase.
