Leica MX400 Operating Instructions Manual page 214

Glossary
Tabulations of accurate data describing celestial position and
health of the satellites over a 24-hour period. The data is up-
loaded to the satellites every 12 hours.
ETA
Estimated Time of Arrival. Calculated on basis of the distance
to the destination and the current (or estimated) speed.
FILTER TIME
If the GPS signals are distorted by Selective Availability (S/A)
the COG and SOG readings will be unstable, especially at low
speeds. In order to smooth out the readings you can adjust the
COG/SOG filter time (CFG 1, COG SOG)
FLUX GATE COMPASS
A magnetic compass sensor without needle or card, whose two-
or three-phase sinusoidal output is a heading reference. Inter-
faced to the navigator via the NMEA interface.
FORCE HEALTHY
A feature of the navigator that permits the user to override the
data flag in the almanac that tells the navigator that the quality
of the data from a satellite is inadequate for navigation. This
feature should be used only with the greatest care.
FORCE UNHEALTHY
A feature of the navigator that permits the operator to inhibit a
satellite position update even though the quality of the data from
that satellite apparently is acceptable.
FUNCTION
A specific operational capability of the navigator.
FUNCTION KEY
A key on the front panel of the navigator that selects a specific
function.
GEODETIC
Associated with the science of Geodesy, which includes the
means of determining absolute position with uniform accuracy
at all points on the earth's surface.
Version 3.3
Operator's Manual
201