Nav 1 Flashcards
Define dead reckoning
Directing an aircraft and determining its position by the application of direction and speed data from a previous position
Four components of DR
- Position
- Direction
- Speed
- Time
Define Position
A geographic point defined by coordinates
Primary coordinate system used by aviators
Longitude/latitude
Latitude
Angular distance north or south of the equator (parallels, measured from 0-90 degrees)
Longitude
the angular distance of a place east or west of the prime meridian at Greenwich, England (meridians, measured from 0-180 degrees and labeled E or W, and ends at the international dateline)
Define Direction
An angular distance from a reference. Measured from 001-360 degrees
Where is magnetic North currently located
Hudson Bay, Canada
The two compass systems in military aircraft
- Remote Gyro Vertical Compass Card (Bearing Distance Heading Indicator, BDHI)
- Stand-by compass
Inertial Navigation System
- Measures angular position (or angular rate)
- Produces attitude and heading information
- Data is used for pitch and roll displays
Describe the stand-by compass
- Direction is taken from a magnetic needle
- Called the “wet” compass
- Unstable during maneuvering
- Reliable due to independence from electrical system
Ways Time can be expressed
- Time of day (0800, 1450)
2. Elapsed time (2+30, 6+10)
Define speed
The magnitude of the velocity of an aircraft. Stated in knots
Instruments for DR
Primary:
- BDHI/Remote gyro vertical compass card
- Clock
- Airspeed indicator
Secondary:
- Altimeter
- Outside air temp
List additional types of navigation
Visual navigation
Electronic navigation
Describe visual navigation
Using ground references to determine current position or to provide steering cues to a destination.
Used by helicopters and low tactical aircraft.
Requires good visibility
Describe Electronic navigation
Requires the use of electronic devices to determine position.
List types of electronic navigation methods
- Ground stations (VOR, TACAN, ADF, VORTAC, etc)
- Transmitters (RADAR, DOPPLER)
- Self-contained (INS)
- Space-based
Three categories of electronic navigation
- Signals received from ground stations
- Devices that transmit their own signals
- Self-contained and requires starting inputs
List ground station signals
VOR, TACAN, ADF, VORTAC, and VOR/DME
List devices that will transmit their own signals
RADAR, DOPPLER
List self-contained devices
INS
Describe TACAN
A ground based system that provides the aviator with precise position information. Position is determined by providing a distance and magnetic bearing from a stationary ground station
Air Vector
True Heading and True Airspeed
