Garmin 740 S Owners Manual

GPSMAP 700 Series Owner’s Manual 57
Radar 
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 this zone. Sentry mode works with all 
Garmin GMR model radars.
Showing Sentry Mode
From the Home screen, select Radar > Sentry.
Enabling Timed Transmit
From the...

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Radar
4. Touch the location of the inner guard-zone corner.
5. Select  Done.
Defining a Circular Guard Zone
You must enable a guard zone before you can define the boundaries of the zone ( page 57). 
You can define a circular guard zone that completely encompasses your boat.
1.  From the Home screen, select  Radar > Sentry > Menu > Sentry Setup > Adjust Guard Zone  > Move 
Guard Zone > Circle .
2.  Touch and drag the location of the outer guard-zone circle, (
).
3....

GPSMAP 700 Series Owner’s Manual 59
Radar 
Showing AIS Vessels on the Radar Screen
AIS requires the use of an external AIS device and active transponder signals from other vessels.
You can configure how other vessels appear on the Radar screen. If any setting (except the AIS display range) 
is configured for one radar mode, the setting is applied to every other radar mode. The details and projected 
heading settings configured for one radar mode are applied to every other radar mode and to the Radar...

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Radar
Hiding the VRM and the EBL
1. From the Home screen, select  Radar.
2.  Select  Cruising, Harbor, or offshore.
3.  Select  Menu > Adjust VRM/eBL > Hide VRM/eBL.
Measuring the Range and Bearing to a Target Object while VRM and EBL are Hidden
If you have hidden VRM and EBL (page 60), you can quickly display the range and bearing to a location by 
touching the screen.
1. From the Home screen, select  Radar.
2.  Select  Cruising, Harbor, or offshore.
3.  Touch a...

GPSMAP 700 Series Owner’s Manual 61
Radar 
6. Select  Cruising, Harbor, offshore, or Sentry.
  The route appears as a magenta line, with the starting point, the destination, and turns indicated.
7.  Review the course indicated by the magenta line.
8.  Follow the magenta line along each leg in the route, steering to avoid land, shallow water , and other 
obstacles.
Navigating Parallel to a Saved Route on the Radar Screen
Before you can browse a list of routes and navigate to one of them, you must record...

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Radar
Radar Overlay and Chart Data Alignment
When using the Radar Overlay, the chartplotter aligns radar data with chart data based on the boat heading, 
which is based by default on data from a magnetic heading sensor connected using a NMEA 0183 or NMEA 
2000 network. If a heading sensor is not available, the boat heading is based on GPS tracking data. 
GPS tracking data indicates the direction in which the boat is moving, not the direction in which the boat 
is...

GPSMAP 700 Series Owner’s Manual 63
Radar 
Tips for Selecting a Radar Range
• Determine what information you need to see on the radar display. 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 in which 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...

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Radar
Manually Adjusting Gain on the Radar Screen
For optimal radar performance that accounts for actual conditions, you can manually adjust the gain. 
NoTe: Depending upon the radar in use, the gain setting configured for use in one radar mode may or may 
not be applied to other radar modes or to the Radar Overlay (page 63). 
1.  From the Home screen, select  Radar.
2.  Select  Cruising, Harbor, offshore, or Sentry mode.
3.  Select  Menu > Gain.
4.  Select  Up to...

GPSMAP 700 Series Owner’s Manual 65
Radar 
Adjusting Sea Clutter on the Radar Screen
You can adjust the appearance of clutter caused by choppy sea conditions. The sea clutter setting affects the 
appearance of nearby clutter and targets more than it affects the appearance of distant clutter and targets. A 
higher sea clutter setting reduces the appearance of clutter caused by nearby waves, but it can also reduce or 
eliminate the appearance of nearby targets. 
NoTe: Depending upon the radar in use, the...

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Radar
4. Complete an action:
• Select  High, Medium, or Low to decrease or increase the appearance of rain clutter, if using a GMR
 
20, 21, 40, 41, 18, 18 HD, 24, 24 HD, 404, or 406 radar. Other targets should remain clearly visible on 
the Radar screen. 
•  Select  Up or Down to decrease or increase the appearance of rain clutter, if using a GMR 604 xHD, 
606 xHD, 1204 xHD, or 1206 xHD radar. Other targets should remain clearly visible on the Radar 
screen. If the...