Icon Filters; Course Extension Lines - Lowrance HDS Gen3 Operator's Manual

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Your vessel's MMSI number
You need to have your own MMSI (Maritime Mobile Service Identity)
number entered in the system to receive addressed messages from
AIS and DSC vessels.
It is also important to have the MMSI number entered to avoid
seeing your own vessel as an AIS target on the chart.
Note:
Ú The Vessel message option in the alarm settings
must be toggled on for any MMSI message to be displayed.

Icon filters

By default, all targets are shown on the panel if an AIS device is
connected to the system.
You can select not to show any targets, or to filter the icons based
on security settings, distance, and vessel speed.

Course extension lines

You can set the length of the Course Over Ground (COG) extension
lines for other AIS vessels. The length of the extension lines is either
set as off, as a fixed distance, or to indicate the distance the vessel
will move in the selected time period. If Off is selected, then no COG
extension lines are shown for the vessel. For information about
extension lines for your vessel, refer to Vessel extension lines in "Chart
settings" on page 49.
Defining dangerous vessels
You can define an invisible guard zone around your vessel. When a
target comes within this distance, the symbol changes to the
"dangerous" target symbol. An alarm is triggered if activated in the
Alarm settings panel.
AIS | HDS Gen3 Operator Manual