Garmin APOLLO GX65 - Manual (Page 321)

seconds of a circle, east or west of the Prime Meridian
(Greenwich, England).
M MA: Missed Approach Point. A code appended to a
waypoint in the database that may not appear on a
published map.
Magnetic North: The region, some distance from the
geographic north pole where the earth’s magnetic
lines concentrate. A magnetic compass points to the
magnetic north.
Magnetic Variation (Mag Var): The angle between
the magnetic and true north. At various points on the
earth it is different due to local magnetic disturbances.
It is shown on charts as isogonic lines marked with
degrees of variation, either east or west. These degrees
must be added to or subtracted from the true course to
get the magnetic course. (Easterly variations are
deducted, and westerly variations are added.) The
Apollo GX automatically sets magnetic variation to 0
degrees at positions above 70 degrees north or south
latitude. See Declination.
MAHP: Missed Approach Hold Point.
MAP: Missed Approach Point.
Map Datum: A mathematical model of the earth used
for the purpose of creating navigation charts and
maps. The Apollo GX uses the WGS-84 map datum.
MESA: Minimum En route 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.
Meter (m): A metric distance measurement equal to
39.37 inches.
Minute: 1/60th of a degree.
15-7
Glossary