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Rain clutter filter
Rain clutter filter control is used as countermeasure against rain in radar echo image.
When you adjust Rain clutter filter, Noise Display mode is automatically switch to ON to show also lower level
radar echo image.
Echo trail time and trail presentation mode
Echo trails are artificial afterglow of radar echo image on the ECDIS display, created by maintaining the echo
intensity once it has been seen, and then removing it after the set time has passed. Target Echoes represent their
movements relative to own ship (Relative trails) or true movements with respect to land (True trails). Echo Trails
are visible in dark green colour, if Noise Display has been selected OFF.
To select echo trail time and to select True or Relative echo trail presentation mode, proceed as follows:
1. Press RADAR button in Control Panel.
2. Select TRUE or RELATIVE presentation mode for trails in Echo trails list box.
3. Set desired time for echo trail time in Echo trail time field. If set time for trails is more than available in the
ECDIS that moment, length of current trail is displayed in the field indicating that trail is shorter than requested.
When current trail disappears from the field length of trails are as requested.
Permanent indication of selected presentation mode of trails is displayed upper right corner of the ECDIS screen.
True trail = TrueTrail
Relative trail = RelTrail
Note, that permanent indication changes it's colour between black and red depending on selected display mode of
own ship:
If display mode of own ship is True motion (TM): Indication of TrueTrail is displayed as black text, indication of
RelTrail is displayed as orange text.
If display mode of own ship is Relative motion (RM): Indication of TrueTrail is displayed as orange text, indication
of RelTrail is displayed as black text.
Radar Echo Overlay • • • • 331
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