Lowrance HDS-12 Gen2 Touch Operation Manual - Page 97

Using AIS

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17 Using AIS The marine Automatic Identification System (AIS) is a location and vessel information reporting system. It allows vessels equipped with AIS to automatically and dynamically share and regularly update their position, speed, course and other information such as vessel identity with similarly equipped vessels. Position is derived from the Global Positioning System (GPS) and communication between vessels is by Very High Frequency (VHF) digital transmissions. If an AIS device is connected, any targets detected by the devices can be displayed and tracked. AIS vessels on chart page AIS targets can be displayed as overlay on radar and chart images, and this feature is an important tool for safe traveling and collision avoidance. You can define alarms to notify you if an AIS target gets too close or if the target is lost. Target symbols The unit uses the AIS target symbols shown below: Symbol Description Sleeping AIS target (not moving or at anchor). Moving and safe AIS target with course extension line. Dangerous AIS target, illustrated with bold line. A target is defined as dangerous based on the CPA and TCPA settings. AIS | Lowrance HDS Gen2 Touch | 95

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| 95
AIS |
Lowrance HDS Gen2 Touch
Using AIS
The marine Automatic Identification System (AIS) is a location and
vessel information reporting system. It allows vessels equipped with
AIS to automatically and dynamically share and regularly update
their position, speed, course and other information such as vessel
identity with similarly equipped vessels. Position is derived from the
Global Positioning System (GPS) and communication between ves-
sels is by Very High Frequency (VHF) digital transmissions.
If an AIS device is connected, any targets detected by the devices
can be displayed and tracked.
AIS targets can be displayed as overlay on radar and chart images,
and this feature is an important tool for safe traveling and collision
avoidance.
You can define alarms to notify you if an AIS target gets too close or
if the target is lost.
Target symbols
The unit uses the AIS target symbols shown below:
Symbol
Description
Sleeping AIS target (not moving or at anchor).
Moving and safe AIS target with course extension line.
Dangerous AIS target,
illustrated with bold line.
A target is defined as dangerous based on
the CPA and TCPA settings.
17
AIS vessels on chart page