16 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 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 |
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| Sleeping AIS target (not moving or at anchor). | |
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| Moving and safe AIS target with course extension line. | |
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| Dangerous AIS target, | A target is defined as dangerous based on |
| illustrated with bold line. | the CPA and TCPA settings. |
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AIS Lowrance HDS Gen2 Touch | 93 |
