Furuno WR2120 Operator's Manual page 26

S2E-17-0208_OM_WR2120_C
Figure 2.9: Range Height Indicator
Figure 2.10: Outline of slice mode
About antenna rotation:
Basically the antenna is rotating clockwise based
on the azimuth origin during PPI and Volume
scan as shown on Figure 2.6.
Figure 2.11: Antenna rotation
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