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User Manual
MAGNETIC NORTH The migrating pole where the earth’s magnetic lines converge. The north magnetic pole
is some distance from true north at 76.1°N 100°W.
MARK Reference points related to cursor position.
MASK ANGLE The Elevation (height above the horizon, measured in Degrees) below which the EKP-IV will
not search for satellites. The Mask Angle used by the EKP-IV is variable. It starts at 8° and under certain condi-
tions, 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 39.37 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 6,076 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 inter-
faces. 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 Brit-
ain. 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 EKP-IV 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 Techni-
cal Committee Maritime (Special Committee 104) to transmit differential GPS corrections.
SA SELECTIVE AVAILABILITY - The degradation of the GPS data broadcast by the SPS (Standard Position-
ing Service), the U.S. Government discontinued the use of SA in April 2000.
SIMULATION Enables use of the EKP-IV without a GPS fix.
SM STATUTE MILE - A distance measurement equal to 5,280 feet or 0.87 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 used. Ranges
from 00 (lowest) to 99 (highest). A scale for indicating the strength of the signal and the likelihood of the lock on
the signal being lost.
TCA TERMINAL CONTROL AREA - Class B airspace.
TPA TRAFFIC PATTERN ALTITUDE - The Altitude required when entering the traffic pattern.
TRACK The historical movement over the ground.
TRACKS & ROUTES Recommended and established routes for ships at sea, including traffic separation schemes,
deep water routes.
TRUE NORTH Geographic north, located at the earth’s north pole.
TTG TIME TO GO - The estimated time needed to reach your destination, based on your current speed and the
distance to destination.
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