AvMap EKPIV series - Manual (Page 87)

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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 000.
SIMULAtIon - Enables use of the EKP-IV without a GPS fix.
SM - STATUTE MILE - A distance measurement equal to 5,80 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.
tWR - TOWER FREQUENCY - The radio frequency for contacting the tower.
UnICoM - UNICOM FREQUENCY - Used for general traffic advisories. Provides airport information
for non controlled airports.
UtC - UNIVERSAL TIME - The current time at the Prime Meridian. Abbreviated as UT or UTC. Also
ref. to as Zulu time (Z)
USeR CoMPACt FLASh - The EKP-IV uses the optional User COMPACT FLASH to save user data:
it is a convenient medium to store and retrieve your information.
USeR WAyPoInt - Place on the chart identified by its coordinates and displayed on the screen
with a reference symbol .
UtM - Universal Transverse Mercator - Metric Grid system used on most large and intermediate
scale land topographic charts and maps.
vdoP - (Vertical Dilution Of Precision)
vnAv - Vertical Navigation - The actual path of the aircraft descending to a final destination.
Provides descent point, Altitude and rate information.
voRtAC - A navaid that provides a VOR, DME and TACAN at one site.
WAAS - Wide Area Augmentation System - The Federal Aviation Administration (FAA), in
cooperation with other DOT organizations and DOD, is augmenting the GPS/SPS with a
satellite-based augmentation system, the WAAS. It will provide a signal-in-space to WAAS users
to support en route through precision approach navigation. After achieving initial operational
capability, the WAAS will then be incrementally improved over the next years to expand the area
of coverage, increase the availability of precision approaches, increase signal redundancy and
reduce operational restrictions.
WAyPoInt - Any point to which one intends to navigate. A sequence of Waypoints makes up a
Flight Plan.
WGS84 - World Geodetic System 1984 Coordinates System or Datum developed by the Defense
Mapping Agency (DMA).
xte - Cross Track Error - The perpendicular distance between the present position and the course
line. Given as a distance right or left of course when facing the destination. Displayed in NAV as
XTE or on the CDI as a deflection.
ZooM In - Shows more detail in a smaller area.
ZooM oUt - Shows a wider area with less details.
APPendIx B - MAP dAtUM
A map datum is a mathematical description of the earth or a part of the earth and is based on the