User Guide

21-30
Radar Gain Controls
You can decrease or increase the radar gain
while in the ground modes. Press s3
and s4 respectively. If you increase
the radar gain enough, you’ll see contour
images on the radar display. Decrease the
gain if this information clutters the display
too much. The new settings do not take
effect until the next radar sweep.
GM (Ground Map) Mode
GM mode is used to find man-made objects on the ground such as buildings, bridges, airbases,
etc. The radar is able to break these objects out from the general ground return and can lock on
strong target returns. It also shows major terrain features such as roads, rivers, forests, etc.
When you switch to GM mode, the radar will automatically point at the current steerpoint (and the
radar cursors will fix at this point) as long as it is within range and within a ±60° azimuth to your
nose. You can slew the radar cursors around this point using W, Z, A and S. If you find a target
you want to lock up, slew the radar cursors over it and designate the target (0 on the numeric
keypad). A diamond will appear over the target indicating that it is locked into Fixed Target Track.
GM mode has four FOV options that allow you to zoom in and sharpen the radar picture:
NRM Normal ground map display
EXP Expands the view within the expansion cue markers by 4:1 over NRM
DBS1 Doppler Beam Sharpening option 1 provides an 8:1 improvement in resolution over
NRM but updates more slowly
DBS2 Doppler Beam Sharpening option 2 expands the view 8:1 over NRM and increases
resolution by 64:1 over NRM but updates very slowly
Cycle through these FOV options by pressing 9.
When you select EXP, the area within the expansion cue markers is expanded to fill the radar
display. The next FOV display, DBS1, doesn’t expand the view any more (which is why EXP mode
has no expansion cue markers), but DSB1 does improve the resolution.
The area in the display for EXP and DBS1 is one-fourth of the range scale. The display area is 2.5 x
2.5 nm, 5 x 5 nm, 10 x 10 nm or 20 x 20 nm square when the range setting is 10 nm, 20 nm, 40
nm or 80 nm, respectively. The 80 nm range scale is not available in DBS1 or DBS2.
EXPANSION
CUE MARKERS