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GPSMAP 400/500 Series Owner’s Manual
Using Charts
To view a split chart/sonar screen:
1.  From the Home screen, select 
Chart/Sonar
2.  Select the type of chart on the split screen.
Navigation 
chart screen
Sonar 
screen
Navigation/Sonar Combination
To access additional settings or options for the chart/sonar screen, 
press 
MENU
.
Automatic Identification System
The Automatic Identification System (AIS) enables you to identify 
and track other vessels.
About AIS
AIS alerts you to area traffic. When connected to an external AIS 
device, the chartplotter can show some AIS information about other 
vessels that are within range, that are equipped with a transponder, 
and that are actively transmitting AIS information. The information 
reported for each vessel includes the Maritime Mobile Service 
Identity (MMSI), the location, the GPS speed, the GPS heading, 
the time that has elapsed since the last position of the vessel was 
reported, the nearest approach, and the time to the nearest approach.
AIS Targeting on the Navigation Chart
Lost 
dangerous 
AIS target
Lost AIS 
target
AIS target
Closest point and 
time of approach to 
dangerous target
Dangerous 
AIS target
Tracking 
AIS target