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Glossary
Meter (m): A metric distance measurement equal to 39.37
inches.
Minute: 1/60th of a degree.
MAHP: Missed Approach Hold Point.
MAP: Missed Approach Point.
MCLS: Multi-Chain Loran Sensor
MESA: Minimum Enroute Safe Altitude is the highest MSA
for every point between the aircraft present position and the
"TO" waypoint with a 5 nm buffer around the course.
MSA: Minimum Safe Altitude is the elevation of the highest
obstruction near the aircraft plus a 1,000 or 2,000 foot buffer
added for safety. In non-mountainous terrain, a 1,000 foot
buffer is added. In mountainous terrain, a 2,000 foot buffer is
added. The result is rounded to the nearest 100 feet.
NANU: Notice Advisory to NAVSTAR Users.
N
Nautical Mile (nm): A distance measurement equal to 6,076
feet, or 1.15 statute mile. One nautical mile is also equal to
one minute of latitude.
NAVSTAR: The name given to GPS satellites formed from
the acronym for NAVigation System with Time And
Ranging.
Non-Directional Beacon (NDB): A low frequency/medium
frequency navigation aid sending non-directional signals that
can be used for navigation.
Non-Sequenced Waypoint: Any waypoint that is not part of a
predefined sequence of waypoints belonging to an approach.
NOTAM: Notice to Airmen.
PDOP: Position Dilution of Precision. A description of the
P
merit of position quality expressing the relationship between
the error in user position and the error in satellite position.
Values considered good for positioning are small, such as 3.
Values greater than 7 are considered poor.
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