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Automatic Identification System

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Showing Tides and Current Indicators NOTE: This feature is available with premium charts, in some areas. You can show static or animated tide and current station indicators on the Navigation chart or Fishing chart. 1 From the Navigation or Fishing chart, select MENU > Layers > Chart > Tides & Currents. 2 Select an option: • To show animated tide station indicators and animated current direction indicators on the chart, select Animated. • To enables the tides and current slider, which sets the time for which tides and currents are reported on the map, select Slider. Showing Satellite Imagery on the Navigation Chart NOTE: This feature is available with premium charts, in some areas. You can overlay high-resolution satellite images on the land or on both land and sea portions of the Navigation chart. NOTE: When enabled, high-resolution satellite images are present only at lower zoom levels. If you cannot see highresolution images in your optional chart region, you can select to zoom in. You also can set the detail level higher by changing the map zoom detail. 1 From the Navigation chart, select MENU > Layers > Chart > Satellite Photos. 2 Select an option: • Select Land Only to show standard chart information on the water, with photos overlaying the land. NOTE: This setting must be enabled to view Standard Mapping® charts. • Select Photo Map Blend to show photos on both the water and the land at a specified opacity. Use the slider bar to adjust the photo opacity. The higher you set the percentage, the more the satellite photos cover both land and water. Viewing Aerial Photos of Landmarks Before you can view aerial photos on the Navigation chart, you must turn on the Photo Points setting in the chart setup. NOTE: This feature is available with premium charts, in some areas. You can use aerial photographs of landmarks, marinas, and harbors to help orient yourself to your surroundings or to acquaint yourself with a marina or a harbor prior to arrival. 1 From the Navigation chart, select a camera icon: • To view an overhead photo, select . • To view a perspective photo, select . The photo was taken from the location of the camera, pointed in the direction of the cone. 2 Select Photo. Automatic Identification System The Automatic Identification System (AIS) enables you to identify and track other vessels, and 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), location, GPS speed, GPS heading, time that has elapsed since the last position of the vessel was reported, nearest approach, and time to the nearest approach. Some chartplotter models also support Blue Force Tracking. Vessels being tracked with Blue Force Tracking are indicated on the chartplotter with a blue-green color. AIS Targeting Symbols Symbol Description AIS vessel. The vessel is reporting AIS information. The direction in which the triangle is pointing indicates the direction in which the AIS vessel is moving. Target is selected. 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 Charts and 3D Chart Views 7

Section	Page
Table of Contents	3
Introduction	7
ECHOMAP Plus 40 Device View	7
Device Keys	7
ECHOMAP Plus 60 Front View	7
Device Keys	7
ECHOMAP Plus 70/90 Front View	7
Device Keys	8
Assigning a Shortcut Key	8
Tips and Shortcuts	8
Downloading the Manuals from the Web	8
Garmin Support Center	8
Inserting Memory Cards	8
Acquiring GPS Satellite Signals	8
Selecting the GPS Source	8
Customizing the Chartplotter	8
Customizing the Home Screen	8
Customizing Pages	8
Creating a New Combination Page with the ECHOMAP Plus 70/90	8
Creating a New Combination Page with the ECHOMAP Plus 60	9
Creating a New Combination Page with the ECHOMAP Plus 40	9
Setting the Vessel Type	9
Adjusting the Backlight	9
Adjusting the Color Mode	9
Changing the Background Image	9
ActiveCaptain App	9
ActiveCaptain Roles	9
Getting Started with the ActiveCaptain App	9
Enabling Smart Notifications	10
Updating Software with the ActiveCaptain App	10
Updating Charts with ActiveCaptain	10
Charts and 3D Chart Views	10
Navigation Chart and Fishing Chart	11
Zooming In and Out of the Chart	11
Panning the Chart with the Keys	11
Selecting an Item on the Map Using the Device Keys	11
Chart Symbols	11
Measuring a Distance on the Chart	11
Creating a Waypoint on the Chart	11
Navigating to a Point on the Chart	11
Viewing Location and Object Information on a Chart	11
Viewing Details about Navaids	12
Heading Line and Angle Markers	12
Setting the Heading Line and Angle Markers	12
Turning on Angle Markers	12
Premium Charts	12
Viewing Tide Station Information	12
Animated Tide and Current Indicators	12
Showing Tides and Current Indicators	13
Showing Satellite Imagery on the Navigation Chart	13
Viewing Aerial Photos of Landmarks	13
Automatic Identification System	13
AIS Targeting Symbols	13
Heading and Projected Course of Activated AIS Targets	13
Activating a Target for an AIS Vessel	14
Viewing Information about a Targeted AIS Vessel	14
Deactivating a Target for an AIS Vessel	14
Viewing a List of AIS Threats	14
Setting the Safe-Zone Collision Alarm	14
AIS Aids to Navigation	14
AIS Distress Signals	14
Navigating to a Distress Signal Transmission	14
AIS Distress Signal Device Targeting Symbols	14
Enabling AIS Transmission Test Alerts	14
Turning Off AIS Reception	14
Chart Menu	15
Chart Layers	15
Chart Layer Settings	15
My Vessel Layer Settings	15
Laylines Settings	15
User Data Layer Settings	16
Other Vessels Layer Settings	16
Water Layer Settings	16
Depth Range Shading	16
Fish Eye 3D Settings	16
Supported Maps	16
Garmin Quickdraw Contours Mapping	16
Mapping a Body of Water Using the Garmin Quickdraw Contours Feature	17
Adding a Label to a Garmin Quickdraw Contours Map	17
Garmin Quickdraw Community	17
Connecting to the Garmin Quickdraw Community with ActiveCaptain	17
Downloading Garmin Quickdraw Community Maps Using ActiveCaptain	17
Sharing Your Garmin Quickdraw Contours Maps with the Garmin Quickdraw Community Using ActiveCaptain	17
Connecting to the Garmin Quickdraw Community with Garmin Connect	17
Sharing Your Garmin Quickdraw Contours Maps with the Garmin Quickdraw Community Using Garmin Connect	17
Downloading Garmin Quickdraw Community Maps Using Garmin Connect	17
Garmin Quickdraw Contours Settings	18
Navigation with a Chartplotter	18
Basic Navigation Questions	18
Destinations	19
Searching for a Destination by Name	19
Selecting a Destination Using the Navigation Chart	19
Searching for a Marine Services Destination	19
Setting and Following a Direct Course Using Go To	19
Stopping Navigation	19
Waypoints	19
Marking Your Present Location as a Waypoint	19
Creating a Waypoint at a Different Location	19
Marking an MOB Location	19
Projecting a Waypoint	19
Viewing a List of all Waypoints	19
Editing a Saved Waypoint	19
Moving a Saved Waypoint	19
Browsing for and Navigating to a Saved Waypoint	20
Deleting a Waypoint or an MOB	20
Deleting All Waypoints	20
Routes	20
Creating and Navigating a Route From Your Present Location	20
Creating and Saving a Route	20
Viewing a List of Routes and Auto Guidance Paths	20
Editing a Saved Route	20
Browsing for and Navigating a Saved Route	20
Browsing for and Navigating Parallel to a Saved Route	21
Deleting a Saved Route	21
Deleting All Saved Routes	21
Auto Guidance	21
Setting and Following an Auto Guidance Path	21
Creating and Saving an Auto Guidance Path	21
Adjusting an Auto Guidance Path	21
Canceling an Auto Guidance Calculation in Progress	21
Setting a Timed Arrival	21
Auto Guidance Path Configurations	21
Adjusting the Distance from Shore	22
Tracks	22
Showing Tracks	22
Setting the Color of the Active Track	22
Saving the Active Track	22
Viewing a List of Saved Tracks	22
Editing a Saved Track	22
Saving a Track as a Route	22
Browsing for and Navigating a Recorded Track	22
Deleting a Saved Track	23
Deleting All Saved Tracks	23
Retracing the Active Track	23
Clearing the Active Track	23
Managing the Track Log Memory During Recording	23
Configuring the Recording Interval of the Track Log	23
Boundaries	23
Creating a Boundary	23
Converting a Route to a Boundary	23
Converting a Track to a Boundary	23
Editing a Boundary	23
Setting a Boundary Alarm	23
Deleting a Boundary	23
Deleting All Saved Waypoints, Routes, and Tracks	24
Sailing Features	24
Setting the Vessel Type	24
Sail Racing	24
Starting Line Guidance	24
Setting the Starting Line	24
Using the Starting Line Guidance	24
Using the Race Timer	24
Setting the Distance between the Bow and the GPS Antenna	24
Laylines Settings	24
Setting the Keel Offset	24
Sailboat Autopilot Operation	25
Wind Hold	25
Setting the Wind Hold Type	25
Engaging Wind Hold	25
Engaging Wind Hold from Heading Hold	25
Adjusting the Wind Hold Angle with the Autopilot	25
Tack and Gybe	25
Tacking and Gybing from Heading Hold	25
Tacking and Gybing from Wind Hold	25
Setting a Tack and Gybe Delay	25
Enabling the Gybe Inhibitor	25
Sonar Fishfinder	25
Stopping the Transmission of Sonar Signals	26
Changing the Sonar View	26
Traditional Sonar View	26
Split-Frequency Sonar View	26
Split-Zoom Sonar View	26
Garmin ClearVü Sonar View	26
SideVü Sonar View	26
SideVü Scanning Technology	26
Panoptix™‎ Sonar Views	27
LiveVü Down Sonar View	27
LiveVü Forward Sonar View	27
RealVü 3D Forward Sonar View	27
RealVü 3D Down Sonar View	27
RealVü 3D Historical Sonar View	28
FrontVü Sonar View	28
Panoptix LiveScope™‎ Sonar View	28
Flasher View	28
Flasher Page Shortcuts	28
Selecting the Transducer Type	28
Calibrating the Compass	29
Selecting a Sonar Source	29
Renaming a Sonar Source	29
Creating a Waypoint on the Sonar Screen	29
Pausing the Sonar Display	29
Measuring Distance on the Sonar Screen	29
Viewing Sonar History	29
Sonar Sharing	29
Adjusting the Level of Detail	29
Adjusting the Color Intensity	30
Sonar Recordings	30
Recording the Sonar Display	30
Stopping the Sonar Recording	30
Deleting a Sonar Recording	30
Playing Sonar Recordings	30
Traditional, Garmin ClearVü, and SideVü Sonar Setup	30
Setting the Zoom Level on the Sonar Screen	30
Setting the Scroll Speed	30
Adjusting the Range of the Depth or Width Scale	30
Sonar Appearance Settings	31
Sonar Alarms	31
Advanced Sonar Settings	31
Transducer Installation Settings	31
Sonar Frequencies	31
Selecting the Transducer Frequency	32
Creating a Frequency Preset	32
Turning On the A-Scope	32
Panoptix Sonar Setup	32
Adjusting the RealVü Viewing Angle and Zoom Level	32
Adjusting the RealVü Sweep Speed	32
LiveVü Forward and FrontVü Sonar Menu	32
Setting the LiveVü and FrontVü Transducer Transmit Angle	32
Setting the FrontVü Depth Alarm	32
LiveVü and FrontVü Appearance Settings	33
RealVü Appearance Settings	33
Panoptix Transducer Installation Settings	33
Setting the Bow Offset	33
Autopilot	34
Autopilot Screen	34
Adjusting the Step Steering Increment	34
Setting the Power Saver	34
Selecting the Preferred Heading Source	34
Engaging the Autopilot	34
Steering Patterns	34
Following the U-Turn Pattern	34
Setting Up and Following the Circles Pattern	34
Setting Up and Following the Zigzag Pattern	34
Following the Williamson Turn Pattern	35
Reactor™‎ Autopilot Remote Control	35
Pairing a Reactor Autopilot Remote Control With a Chartplotter	35
Changing the Functions of the Reactor Autopilot Remote Control Action Keys	35
Force™‎ Trolling Motor Control	35
Connecting to a Trolling Motor	35
Adding the Trolling Motor Controls to Screens	35
Trolling Motor Control Bar	35
Trolling Motor Settings	36
Assigning a Shortcut to the Trolling Motor Remote Control Shortcut Keys	36
Calibrating the Trolling Motor Compass	36
Setting the Bow Offset	36
Digital Selective Calling	36
Chartplotter and NMEA 0183 VHF Radio Functionality	36
Turning On DSC	36
DSC List	36
Viewing the DSC List	36
Adding a DSC Contact	36
Incoming Distress Calls	36
Navigating to a Vessel in Distress	37
Position Tracking	37
Viewing a Position Report	37
Navigating to a Tracked Vessel	37
Creating a Waypoint at the Position of a Tracked Vessel	37
Editing Information in a Position Report	37
Deleting a Position-Report Call	37
Viewing Vessel Trails on the Chart	37
Individual Routine Calls	37
Selecting a DSC Channel	37
Making an Individual Routine Call	37
Making an Individual Routine Call to an AIS Target	37
Gauges and Graphs	37
Viewing the Compass	37
Viewing Trip Gauges	37
Resetting Trip Gauges	37
Viewing Engine and Fuel Gauges	38
Selecting the Number of Engines Shown in Gauges	38
Customizing the Engines Shown in Gauges	38
Enabling Status Alarms for Engine Gauges	38
Enabling Some Engine Gauge Status Alarms	38
Setting the Fuel Alarm	38
Setting the Fuel Capacity of the Vessel	38
Synchronizing the Fuel Data with the Actual Vessel Fuel	38
Viewing the Wind Gauges	38
Configuring the Sailing Wind Gauge	38
Configuring the Speed Source	38
Configuring the Heading Source of the Wind Gauge	38
Customizing the Close-Hauled Wind Gauge	38
Digital Switching	39
Adding and Editing a Digital Switching Page	39
Tide, Current, and Celestial Information	39
Tide Station Information	39
Current Station Information	39
Celestial Information	39
Viewing Tide Station, Current Station, or Celestial Information for a Different Date	39
Viewing Information for a Different Tide or Current Station	39
Media Player	39
Opening the Media Player	39
Icons	39
Selecting the Media Source	39
Playing Music	40
Browsing for Music	40
Enabling Alphabetical Search	40
Setting a Song to Repeat	40
Setting All Songs to Repeat	40
Setting Songs to Shuffle	40
Adjusting the Volume	40
Enabling and Disabling Zones	40
Muting the Media Volume	40
VHF Radio	40
Scanning VHF Channels	40
Adjusting the VHF Squelch	40
Radio	40
Setting the Tuner Region	40
Changing the Radio Station	40
Changing the Tuning Mode	40
Presets	40
Saving a Station as a Preset	40
Removing a Preset	40
DAB Playback	40
Setting the DAB Tuner Region	40
Scanning for DAB Stations	40
Changing DAB Stations	40
Selecting a DAB Station from a List	41
Selecting a DAB Station from a Category	41
DAB Presets	41
Saving a DAB Station as a Preset	41
Selecting a DAB Preset from a List	41
Removing DAB Presets	41
SiriusXM®‎ Satellite Radio	41
Locating a SiriusXM Radio ID	41
Activating a SiriusXM Subscription	41
Customizing the Channel Guide	41
Saving a SiriusXM Channel to the Presets List	41
Unlocking SiriusXM Parental Controls	41
Setting Parental Controls on SiriusXM Radio Channels	41
Changing a Parental Passcode on a SiriusXM Radio	41
Restoring Default Parental Control Settings Values	41
Clearing All Locked Channels on a SiriusXM Radio	41
Setting the Device Name	42
Updating the Media Player Software	42
Device Configuration	42
Turning On the Chartplotter Automatically	42
System Settings	42
Display Settings	42
GPS Settings	42
Viewing the Event Log	42
Viewing System Software Information	42
Viewing E-label Regulatory and Compliance Information	42
My Vessel Settings	42
Setting the Keel Offset	43
Setting the Water Temperature Offset	43
Calibrating a Water Speed Device	43
Setting the Fuel Capacity of the Vessel	43
Synchronizing the Fuel Data with the Actual Vessel Fuel	43
Customizing Engine Gauge and Fuel Gauge Limits	43
Communications Settings	44
NMEA 0183	44
NMEA 0183 Settings	44
NMEA 2000 Settings	44
Naming Devices and Sensors on the Network	44
Wi‑Fi Network	44
Setting Up the Wi‑Fi Wireless Network	44
Connecting a Wireless Device to the Chartplotter	44
Changing the Wireless Channel	44
Setting Alarms	44
Navigation Alarms	44
System Alarms	44
Setting the Fuel Alarm	45
Units Settings	45
Navigation Settings	45
Other Vessel Settings	45
Restoring the Original Chartplotter Factory Settings	45
Sharing and Managing User Data	45
Connecting to a Garmin Device to Share User Data	45
User Data Sharing Cable Wiring Diagram	46
Selecting a File Type for Third-Party Waypoints and Routes	46
Copying User Data from a Memory Card	46
Copying User Data to a Memory Card	46
Copying Built-In Maps to a Memory Card	46
Copying Waypoints, Routes, and Tracks from HomePort to a Chartplotter	46
Backing Up Data to a Computer	46
Restoring Backup Data to a Chartplotter	46
Saving System Information to a Memory Card	46
Clearing Saved Data	46
Appendix	47
Registering Your Device	47
Software Update	47
Loading the New Software on a Memory Card	47
Updating the Device Software	47
Cleaning the Screen	47
Screenshots	47
Capturing Screenshots	47
Copying Screenshots to a Computer	47
Troubleshooting	48
My device will not acquire GPS signals	48
My device will not turn on or keeps turning off	48
Changing the Fuse in the Power Cable	48
My sonar does not work	48
My device is not creating waypoints in the correct location	48
My device does not display the correct time	48
Specifications	48
All Models	48
4-Inch Models	48
6-Inch Models	49
7-Inch Models	49
9-Inch Models	49
Sonar Models Specifications	49
NMEA 0183 Information	49
NMEA 2000 PGN Information	50

Match case Limit results 1 per page

Showing Tides and Current Indicators

NOTE:

This feature is available with premium charts, in some

areas.

You can show static or animated tide and current station

indicators on the Navigation chart or Fishing chart.

From the Navigation or Fishing chart, select

Layers

Chart

Tides & Currents

Select an option:

•

To show animated tide station indicators and animated

current direction indicators on the chart, select

Animated

•

To enables the tides and current slider, which sets the

time for which tides and currents are reported on the map,

select

Slider

Showing Satellite Imagery on the Navigation Chart

NOTE:

This feature is available with premium charts, in some

areas.

You can overlay high-resolution satellite images on the land or

on both land and sea portions of the Navigation chart.

NOTE:

When enabled, high-resolution satellite images are

present only at lower zoom levels. If you cannot see high-

resolution images in your optional chart region, you can select

to zoom in. You also can set the detail level higher by changing

the map zoom detail.

From the Navigation chart, select

Layers

Chart

Satellite Photos

Select an option:

•

Select

Land Only

to show standard chart information on

the water, with photos overlaying the land.

NOTE:

This setting must be enabled to view Standard

Mapping

charts.

•

Select

Photo Map Blend

to show photos on both the

water and the land at a specified opacity. Use the slider

bar to adjust the photo opacity. The higher you set the

percentage, the more the satellite photos cover both land

and water.

Viewing Aerial Photos of Landmarks

Before you can view aerial photos on the Navigation chart, you

must turn on the Photo Points setting in the chart setup.

NOTE:

This feature is available with premium charts, in some

areas.

You can use aerial photographs of landmarks, marinas, and

harbors to help orient yourself to your surroundings or to

acquaint yourself with a marina or a harbor prior to arrival.

From the Navigation chart, select a camera icon:

•

To view an overhead photo, select

•

To view a perspective photo, select

. The photo was

taken from the location of the camera, pointed in the

direction of the cone.

Select

Photo

Automatic Identification System

The Automatic Identification System (AIS) enables you to

identify and track other vessels, and 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), location, GPS speed, GPS

heading, time that has elapsed since the last position of the

vessel was reported, nearest approach, and time to the nearest

approach.

Some chartplotter models also support Blue Force Tracking.

Vessels being tracked with Blue Force Tracking are indicated on

the chartplotter with a blue-green color.

AIS Targeting Symbols

Symbol Description

AIS vessel. The vessel is reporting AIS information. The

direction in which the triangle is pointing indicates the

direction in which the AIS vessel is moving.

Target is selected.

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

Charts and 3D Chart Views