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PRIMUS
r
880
Digital
W
eather
Radar
System
A28-1146-102-00
Operating Controls
3-14
NOTES: 1. REACT’s three functions (attenuation
compensation, cyan field, and forcing targets to
magenta) are switched on and off with the RCT
switch.
2. Refer to Section 5, Radar Facts, for a description
of REACT.
D GMAP (Ground Mapping) - The GMAP position puts the radar
system in the Ground Mapping mode. The system is fully
operational and all parameters are set to enhance returns from
ground targets.
NOTE: REACT, TGT, or TRB modes are not selectable in GMAP.
WARNING
WEATHER TYPE TARGETS ARE NOT CALIBRATED WHEN
THE RADAR IS IN THE GMAP MODE. BECAUSE OF THIS, DO NOT
USE THE GMAP MODE FOR WEATHER DETECTION.
As a constant reminder that GMAP is selected, the alphanumerics
are changed to green, the GMAP legend is displayed in the
mode field, and the color scheme is changed to cyan, yellow, and
magenta. Cyan represents the least reflective return, yellow is a
moderate return, and magenta is a strong return.
If GMAP is selected before the initial RTA warmup period is
complete (approximately 45 to 90 seconds), the white WAIT legend
is displayed in the mode field. In wait mode, the transmitter and
antenna scan are inhibited and the memory is erased. When the
warmup period is complete, the system automatically switches to
the GMAP mode.
D FP (FlightPlan) -The FPposition puts the radarsystem in theflight
plan mode, which clears the screen of radar data so ancillary data
can be displayed. Examples of this data are:
- Navigation displays
- Electrical discharge (lightning) data.
NOTE: In the FP mode, the radar RTA is put in standby, the
alphanumerics are changed to cyan, and the FLTPLN
legend is displayed in the mode field.