Sperry Marine Visionmaster FT ECDIS User Manual page 466

Radar
Manual Fine Tuning Adjustment
For manual fine tuning long pulse (LP) must be selected, ideally using a
high scale ratio that shows a known target near to the edge of the display.
To manually fine tune do the following.
1. Click the Manual radio button. In manual
mode the tuning indicator colour
changes from grey to green.
2. Left click in the Tune bar to activate the
control. The tune bar divides into two, the upper bar is the tuning
indicator (shown in green), and the lower bar is the tuning control
level indicator (shown in blue) which indicates how well the
receiver is tuned.
3. Move the trackball left or right to adjust the tuning control (lower
bar) until the maximum level is reached on the tuning indicator
(upper bar). If distant targets are visible, use these for the final
adjustment.
4. Left click to set the level and de-activate the bar. A right click will
de-activate the bar but not set the new level.
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ECDIS User Guide
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