20 Glossary H
Growing Degree Days. A measurement of heat units since planting above a prescribed base
temperature.
GLONASS
A Russian space-based satellite navigation system.
GNSS
Global Navigation Satellite System. A system of GPSUSand Russian satellites that provide
information about geo-spatial positioning. A GNSS receiver can determine its longitude, latitude and
altitude. In the future, GNSSwill also use Chinese GPS satellites.
GPS
Global Positioning System. A space-based satellite navigation system. A GPS receiver can determine
its position by using GPS satellites.
GPSautonomous positioning
A mode of operation in which a GPS receiver computes position fixes in real time from satellite data
alone, without reference to data supplied by a base station. Autonomous positioning is the least
precise positioning procedure a GPS receiver can perform, yielding position fixes that are precise to
±100 meters.
H
HDOP
The horizontal component of PDOP.
Header height
A sensor that indicates the position of the head.
I
IMD
Inertial Measurement Device.
IMEI
International Mobile Station Equipment Identity. A number to identify mobile equipment. The GSM
network uses this number to identify valid devices. The IMEI number has no relationship to the
subscriber.
Implement steering
A system that actively steers the implement being towed by a vehicle.
IMU
Inertial Measurement Unit. An electronic device that measures and reports on a vehicle's velocity,
orientation, and gravitational forces, using a combination of accelerometers and gyroscopes.
Integrated radio
Version 9.25, Revision B FM-1000 Integrated Display User Guide 519
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