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Depth and Water Temperature Graphs

If you are using a depth-capable transducer, or are receiving

water depth information over NMEA 0183 or NMEA 2000, you

can view a graphic log of depth readings over time. If you are

using a temperature-capable transducer, or are receiving water

temperature information over NMEA 0183 or NMEA 2000, you

can view a graphic log of temperature readings over time.

The graphs scroll to the left as information is received.

Select Sonar > Data Graphs.

Setting the Depth and Water Temperature Graph

Range and Time Scales

You can indicate the amount of time and the range of depth that

appear in the depth and water temperature graphs.

Select Sonar > Data Graphs > MENU.

Select Depth Graph Settings or Temperature Graph

Settings.

Select an option:

• To set a time-elapsed scale, select Duration. The default

setting is 10 minutes. Increasing the time-elapsed scale

allows you to view variations over a longer period of time.

Decreasing the time-elapsed scale allows you to view

more detail over a shorter period of time.

• To set the depth-range or temperature-range scale, select

Scale. Increasing the scale allows you to view more

variation in readings. Decreasing the scale allows you to

view more detail in the variation.

The marine radar transmits microwave energy that has the

potential to be harmful to humans and animals. Before

beginning radar transmission, verify that the area around the

radar is clear. The radar transmits a beam approximately 12°

above and below a line extending horizontally from the center of

the radar. Avoid looking directly at the radar, because the eyes

are the most susceptible parts of the body.

NOTE: Not all models support radar.

When you connect your compatible chartplotter to an optional

Garmin marine radar, such as a GMR™ 1206 xHD or a GMR 24

HD, you can view more information about your surroundings.

The GMR transmits a narrow beam of microwave energy as it

rotates to a 360° pattern. When the transmitted energy contacts

a target, some of that energy is reflected back to the radar.

Radar Display Modes

NOTE: Not all modes are available with all radar devices and all

chartplotters.

Select Radar, and select a mode.

Cruising Mode: Shows a full-screen image of the gathered

radar information.

Harbor Mode: Intended for use in inland waters, this mode

works best with short-range signals (2 nm or less).

Offshore Mode: Intended for use in open waters, this mode

works best with long-range signals.

Sentry Mode: Allows you to put the radar into timed-transmit

mode, in which you can configure a radar transmit and

standby cycle to conserve power. You can also enable a

guard zone in this mode, which identifies a safe zone around

your boat. If you switch from Sentry mode to another mode,

the radar switches to full-time transmission and disables all

guard zones.

Radar

WARNING

Radar Overlay Mode: Shows a full-screen image of the

gathered radar information on top of the Navigation chart.

The Radar overlay displays data based on the most recently

used radar mode.

Transmitting Radar Signals

NOTE: As a safety feature, the radar enters standby mode after

it warms up. This gives you an opportunity to verify the area

around the radar is clear before beginning radar transmission.

With the chartplotter off, connect your radar as described in

the radar installation instructions.

Turn on the chartplotter.

The radar warms up and a countdown alerts you when the

radar is ready.

Select Radar.

Select a radar mode.

A countdown message appears while the radar is starting up.

Select MENU > Transmit Radar.

Adjusting the Zoom Scale on the Radar

Screen

The radar zoom scale, also called the radar signal range,

represents the distance from your position (the center) to the

outermost ring.

From a Radar screen, select

Each ring represents an even division of the zoom scale.

For example, if the zoom scale is set at 3 miles, each ring

represents 1 mile from the center out.

Tips for Selecting a Radar Zoom Scale

The radar zoom scale, or radar signal range, indicates the

length of the pulsed signal transmitted and received by the

radar. As the range increases, the radar transmits longer pulses

in order to reach distant targets. Closer targets, especially rain

and waves, also reflect the longer pulses, which can add noise

to the Radar screen. Viewing information about longer-range

targets can also decrease the amount of space available on the

Radar screen for viewing information about shorter-range

targets.

• Determine what information you need to see on the Radar

screen.

For example, do you need information about nearby weather

conditions or targets and traffic, or are you more concerned

about distant weather conditions?

• Assess the environmental conditions where the radar is

being used.

Especially in inclement weather, longer-range radar signals

can increase the clutter on the Radar screen and make it

more difficult to view information about shorter-range targets.

In rain, shorter-range radar signals can enable you to view

information about nearby objects more effectively, if the rain

clutter setting is configured optimally.

• Select the shortest effective range, given your reason for

using radar and the present environmental conditions.

Sentry Mode

Sentry mode allows you to put the radar into timed-transmit

mode, in which you can configure a radar transmit and standby

cycle to conserve power. You can also enable a guard zone in

this mode, which identifies a safe zone around your boat and

sounds an alarm when a radar object enters the zone. Sentry

mode works with all Garmin GMR model radars.

Enabling Timed Transmit

From the sentry screen, select MENU > Sentry Setup >

Timed Transmit > On.