Version 2.0
201
Glossary
Operator’s Manual
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. Interfaced to
the navigator via the NMEA interface.
FM
Frequency Modulation – The method by which a signal offsets
the frequency in order to modulate it on a data link.
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.
G
EODETIC
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.
GEOGRAPHIC COORDINATES
Angular displacements along parallels of latitude and meridians of
longitude on an ellipsoidal surface. Ellipsoidal coordinates.
GEOID
The Earth’s surface with all topographical undulations removed
Summary of Contents for MX420
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