Garmin ECHOMAP UHD 72sv Owners Manual - Page 13

Symbol Description Target is 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 is lost. A green X indicates that the AIS transmission from the vessel is 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. Dangerous target is lost. A red X indicates that the AIS transmission from the vessel is 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. 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. NOTE: Vessels being tracked with the Blue Force Tracking feature are indicated with a blue-green color regardless of their status. 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. When course over ground, heading, and rate of turn information are provided by an activated AIS target, the projected course of the target is calculated based on the course over ground and the rate of turn information. The direction in which the target is turning, which is also based on the rate of turn information, is indicated by the direction of the barb at the end of the heading line. The length of the barb does not change. When course over ground and heading information are provided by an activated AIS target, but rate of turn information is not provided, the projected course of the target is calculated based on the course over ground information. Activating a Target for an AIS Vessel 1 From a chart or a 3D chart view, select an AIS vessel. 2 Select AIS Vessel > Activate Target. Viewing Information about a Targeted AIS Vessel You can view the AIS signal status, MMSI, GPS speed, GPS heading, and other information that is reported about a targeted AIS vessel. 1 From a chart or a 3D chart view, select an AIS vessel. 2 Select AIS Vessel. Deactivating a Target for an AIS Vessel 1 From a chart or a 3D chart view, select an AIS vessel. 2 Select AIS Vessel > Deactivate Target. Viewing a List of AIS Threats From a chart or 3D chart view, select MENU > Other Vessels > AIS List. Setting the Safe-Zone Collision Alarm Before you can set a safe-zone collision alarm, you must have a compatible chartplotter connected to an AIS device. The safe-zone collision alarm is used only with AIS. The safe zone is used for collision avoidance, and can be customized. 1 Select Settings > Alarms > AIS > AIS Alarm > On. A message banner appears and an alarm sounds when an AIS-activated vessel enters the safe-zone area around your boat. The object is also labeled as dangerous on the screen. When the alarm is off, the message banner and audible alarm are disabled, but the object is still labeled as dangerous on the screen. 2 Select Range. 3 Select a distance for the safe-zone radius around your vessel. 4 Select Time To. 5 Select a time at which the alarm will sound if a target is determined to intersect the safe zone. For example, to be notified of a pending intersection 10 minutes before it will likely occur, set Time To to 10, and the alarm will sound 10 minutes before the vessel intersects the safe zone. AIS Aids to Navigation An AIS aid to navigation (ATON) is any kind of navigational aid that is transmitted over the AIS radio. ATONs are displayed on the charts and have identifying information, such as position and type. There are three main kinds of AIS ATONs. Real ATONs physically exist and send their identifying and location information from their actual location. Synthetic ATONs physically exist, and their identifying and location information is sent from another location. Virtual ATONs do not actually exist, and their identifying and location information is sent from another location. You can view AIS ATONs on the chart when the chartplotter is connected to a compatible AIS radio. To show AIS ATONs, from a chart, select MENU > Layers > Chart > Navaid > ATONs. You can view more information about an ATON if you select the ATON on the chart. Symbol Meaning Real or synthetic ATON Real or synthetic ATON: Topmark North Real or synthetic ATON: Topmark South Real or synthetic ATON: Topmark East Real or synthetic ATON: Topmark West Real or synthetic ATON: Topmark Special Real or synthetic ATON: Topmark Safe Charts and 3D Chart Views 7