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lAndmArKS - Any prominent object such as monument, building, silo, tower, mast, on land
which can be used in determining a location or a direction
lAT - LATITUDE - The distance north or south of the equator, measured in an arc with the equator
being 0° and the poles being 90°.
lon - LONGITUDE - The distance east or west of the Prime Meridian (0°), which intersects
Greenwich, England. The range is 0°–180°E, moving east of 0° and 0°–180°W, moving west of
0°.
lorAn - The Loran chains are groups of transmitting stations that use timed radio pulse
transmissions.
mAGneTIC norTh - The migrating pole where the earth's magnetic lines converge. The north
magnetic pole is some distance from true north at 6.1°N 100°W.
mArK - Reference points related to cursor position.
mASK AnGle - The Elevation (height above the horizon, measured in Degrees) below which the
Geopilot II Plus will not search for satellites. The Mask Angle used by the Geopilot II Plus is
variable. It starts at 8° and under certain conditions, may drop as low as 0°.
mIn - MINUTE - A unit of measure, equal to1/60th of one Degree of a circle.
morA - This Minimum Off-Route Altitude provides minimum altitudes for terrain and obstruction
clearance within the section outlined by the Latitude and Longitude lines. Mora values clear
all terrain and obstructions by 1,000' in areas where the highest terrain and obstructions are
5,000' MSL or lower. Mora values clear all terrain and obstructions by 2,000' in areas where the
highest terrain and obstructions are 5,000' MSL or higher. Moras are not shown where there is
no published data.
MOVING MAP - The Moving Map is the default state of the software. This mode represents the
Moving Map screen and Data Window.
mT - METER - A metric distance measurement equal to 39.3 inches.
nATUrAl feATUreS - Any topographic feature formed by the action of natural processes:
coastlines, relief, glaciers, ...
ndb - NON-DIRECTIONAL BEACON - A low/medium-frequency navigation aid that sends non-
directional signals that can be used for navigation.
nm - NAUTICAL MILE - A distance measurement equal to 6,06 feet or 1.15 Statute Miles. Also
equal to one Minute of Latitude.
nmeA - NATIONAL MARINE ELECTRONICS ASSOCIATION - Professional organization that
defines and maintains the standard serial format used by marine electronic navigation equipment
and computer interfaces. NMEA format has been adopted by parts of the avionics industry.
offSeT - Distance away from desired course.
oSGb - ORDNANCE SURVEY OF GREAT BRITAIN - A Coordinate System describing only Great
Britain. Generally used with GBR36 datum, which also describes only Great Britain. This
Coordinate System cannot be used in any other part of the world.
PoSITIon - A location that is obtained in real-time and expressed as coordinates. Sometimes
called a fix. Also a Waypoint location obtained from a chart or other source.
reCeIver - The electronic components of the Geopilot II Plus that receive satellite signals.
rhUmb lIne - A constant true Heading between a starting point and a completion point.
rmS - ROOT MEAN SQUARE - A measurement of error that is: the square root of the average of
the position errors, squared.
rTCm - RADIO TECHNICAL COMMITTEE MARITIME - The data format created by the
Radio Technical Committee Maritime (Special Committee 104) to transmit differential GPS
corrections.
SA - SELECTIVE AVAILABILITY - The degradation of the GPS data broadcast by the SPS (Standard
Positioning Service), the U.S. Government discontinued the use of SA in April 2000.
SImUlATIon - Enables use of the Geopilot II Plus without a GPS fix.
Sm - STATUTE MILE - A distance measurement equal to 5,280 feet or 0.8 Nautical Mile.
SoG - SPEED OVER GROUND - A calculation of the rate of movement over the ground.
SPS - STANDARD POSITIONING SERVICE - The civilian-access signal broadcast by the GPS
satellites.
SQ - SIGNAL QUALITY - An indication of the signal-to-noise ratio of each satellite signal being
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