Owner's Manual

22 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 
Automatic Identication System
The Automatic Identication System (AIS) enables you to identify
and track other vessels.
About AIS
AIS alerts you to area trafc. 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