Using Cruising Mode; Using Sentry Mode - Garmin GPSMAP 4212 Owner's Manual

Using Cruising Mode

Cruising mode is the standard radar operation. If you switch from Sentry mode to Cruising mode,
the antenna will go into full-time transmission and will disable any guard zones.
To enable Cruising mode, select
Use the Cruising screen to view a full-screen image of the gathered radar information. Your position
is in the center of the screen, and the rings provide distance measurements.
Range rings
Heading line
Distance
between rings
The zoom scale represents the distance from your position (the center) to the outermost ring. Each
ring represents an even division of the zoom scale. For example, if the zoom scale is set at three
miles, each ring represents one mile from the center out. Adjust the zoom scale using the
Range (-/+) keys.

Using Sentry Mode

NOTE: When Sentry mode is enabled, all MARPA targets are cancelled, and you cannot acquire
MARPA targets until you exit Sentry mode.
Sentry mode allows you to put the radar antenna into Timed-transmit mode, in which you can
configure a transmit and standby cycle. You can also enable a guard zone in Sentry mode, which
identifies a safe zone around your boat. An alarm sounds when a radar object enters this zone.
To enable Sentry mode, select
To enable timed-transmit mode:
From the Home screen, select
To set the standby and transmit times:
1. From the Radar screen, select
2. Select Timed Xmit if it is set to off.
3. Select Stdby Time or
4. Enter the time in minutes using the Rocker.
5. Select Done.
GPSMAP 4000 Series Owner's Manual
Radar > Cruising.
Radar > Sentry.
Radar > Sentry
Menu > Sentry
Xmit Time.
> Menu > Sentry Setup
Setup.
Using Radar
Zoom scale
> Timed Xmit.
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