USGlobalsat GH-625B User Manual - Manual (Page 60)

GH-625
Page 60
11. Glossary
Activity
Relates to data being transmitted from GH-625. Activity is a history or log
of events. Activity data includes time or distance updates.
Waypoint
Waypoints are sets of coordinates that identify a point in physical space. For
the purposes of terrestrial navigation, these coordinates usually include
longitude and latitude, and sometimes altitude (particularly for air
navigation).
Trackpoint
The current moving trace.
Navigation
The act of determining the course or heading of movement.
2D Operating
Mode
A “two-dimensional GPS position fix” includes only horizontal coordinates.
It requires a minimum of three visible satellites.
3D Operating
Mode
A “three-dimensional GPS position fix” includes horizontal coordinates, plus
elevation. It requires a minimum of four visible satellites.
Weak Signal
GPS signal is weak (GPS is fixing).
Receiving
Can’t find GPS (GPS turned off or broken down).
WAAS/EGNOS
Wide Area Augmentation System / European Geostationary Navigation
Overlay Service. These are two satellite-based systems that can be used to
increase the accuracy of GPS position fixes.
IPX7
An IPX7 designation means the GPS case can withstand accidental
immersion in one meter of water for up to 30 minutes.
GMT
Greenwich Mean Time (GMT) is a term originally referring to mean solar
time at the Royal Observatory, Greenwich in England. It is now often used
to refer to Coordinated Universal Time (UTC) when this is viewed as a time
zone, although strictly UTC is an atomic time scale which only approximates
GMT in the old sense. It is also used to refer to Universal Time (UT), which
is the astronomical concept that directly replaced the original GMT.