Ais targeting symbols – Garmin GPSMAP 545s User Manual
Page 29
GPSMAP 400/500 Series Owner’s Manual
23
Using Charts
AIS Targeting Symbols
Symbol
Description
AIS vessel. The vessel is reporting AIS information. The
direction in which the triangle is pointing indicates the
direction in which the AIS vessel is moving.
The target has been selected.
The target has been activated. The target appears
larger on the chart. A green line attached to the target
indicates the heading of the target. The MMSI, speed, and
direction of the vessel appear beneath the target, if the
details setting has been set to
Show (
). If the AIS
transmission from the vessel is lost, a message banner
appears.
Target has been lost. A green
X indicates that the AIS
transmission from the vessel has been lost, and the
chartplotter displays a message banner asking whether the
vessel should continue to be tracked. If you discontinue
vessel tracking, the lost target symbol disappears from the
chart or the 3D chart view.
Dangerous target in range. The target flashes while an
alarm sounds and a message banner appears. After the
alarm has been acknowledged, a solid red triangle with
a red line attached to it indicates the location and the
heading of the target. If the safe-zone collision alarm has
been set to
Off, the target flashes, but the audible alarm
does not sound and the alarm banner does not appear. If
the AIS transmission from the vessel is lost, a message
banner appears.
The location of this symbol indicates the closest point of
approach to a dangerous target, and the numbers near the
symbol indicate the time to the closest point of approach to
that target.
Dangerous target has been lost. A red
X indicates that the
AIS transmission from the vessel has been lost, and the
chartplotter displays a message banner asking whether the
vessel should continue to be tracked. If you discontinue
vessel tracking, the lost dangerous target symbol
disappears from the chart or the 3D chart view.
Heading and Projected Course of Activated AIS
Targets
When heading and course over ground information are provided by
an activated AIS target, the heading of the target appears on a chart
as a solid line attached to the AIS target symbol. A heading line does
not appear on a 3D chart view.
The projected course of an activated AIS target appears as a dashed
line on a chart or a 3D chart view. The length of the projected course
line is based on the value of the projected heading setting
(
). If an activated AIS target is not transmitting speed
information, or if the vessel is not moving, a projected course line
does not appear. Changes in the speed, course over ground, or rate of
turn information transmitted by the vessel can impact the calculation
of the projected course line.