Garmin GPSMAP 557xs Kullanıcı El Kitabı - Sayfa 24

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Rings: Shows the range rings that help you to visualize

distances on the radar screen.

Nav. Lines: Shows the navigation lines that indicate the course

you have set using Route To, Guide To, or Go To.

Waypoints: Shows waypoints on the radar screen.

Front-of-Boat Offset

The front-of-boat offset compensates for the physical location of

the radar scanner on a boat, if the radar scanner does not align

with the bow-stern axis.

Measuring the Potential Front-of-Boat Offset

The front-of-boat offset compensates for the physical location of

the radar scanner on a boat, if the radar scanner does not align

with the bow-stern axis.

Using a magnetic compass, take an optical bearing of a

stationary target located within viewable range.

Measure the target bearing on the radar.

If the bearing deviation is more than +/- 1°, set the front-of-

boat offset.

Setting the Front-of-Boat Offset

Before you can set the front-of-boat offset, you must measure

the potential front-of-boat offset.

The front-of-boat offset setting configured for use in one radar

mode is applied to every other radar mode and to the Radar

overlay.

From a Radar screen or the Radar overlay, select Menu >

Radar Setup > Front of Boat.

Select Up or Down to adjust the offset.

Digital Selective Calling

Networked Chartplotter and VHF Radio

Functionality

If you have a NMEA 0183 VHF radio or a NMEA 2000 VHF

radio connected to your chartplotter, these features are

enabled.

• The chartplotter can transfer your GPS position to your radio.

If your radio is capable, GPS position information is

transmitted with DSC calls.

• The chartplotter can receive digital selective calling (DSC)

distress and position information from the radio.

• The chartplotter can track the positions of vessels sending

position reports.

If you have a Garmin NMEA 2000 VHF radio connected to your

chartplotter, these features are also enabled.

• The chartplotter allows you to quickly set up and send

individual routine call details to your Garmin VHF radio.

• When you initiate a man-overboard distress call from your

radio, the chartplotter shows the man-overboard screen and

prompts you to navigate to the man-overboard point.

• When you initiate a man-overboard distress call from your

chartplotter, the radio shows the Distress Call page to initiate

a man-overboard distress call.

Turning On DSC

Select Settings > Other Vessels > DSC.

DSC List

The DSC list is a log of the most recent DSC calls and other

DSC contacts you have entered. The DSC list can contain up to

100 entries. The DSC list shows the most recent call from a

boat. If a second call is received from the same boat, it replaces

the first call in the call list.

Viewing the DSC List

Before you can view the DSC list, the chartplotter must be

connected to a VHF radio that supports DSC.

Select Nav Info > Other Vessels > DSC List.

Adding a DSC Contact

You can add a vessel to your DSC list. You can make calls to a

DSC contact from the chartplotter.

Select Nav Info > Other Vessels > DSC List > Add

Contact.

Enter the Maritime Mobile Service Identity (MMSI) of the

vessel.

Enter the name of the vessel.

Incoming Distress Calls

If your Garmin chartplotter and VHF radio are connected using

NMEA 0183 or NMEA 2000, your chartplotter alerts you when

your VHF radio receives a DSC distress call. If position

information was sent with the distress call, that information is

also available and recorded with the call.

designates a distress call in the DSC list and marks the

position of the vessel on the Navigation chart at the time of the

DSC distress call.

Navigating to a Vessel in Distress

designates a distress call in the DSC list and marks the

position of a vessel on the Navigation chart at the time of the

DSC distress call.

Select Nav Info > Other Vessels > DSC List.

Select a position-report call.

Select Navigate To.

Select Go To or Route To.

Man-Overboard Distress Calls Initiated from a VHF

Radio

When your chartplotter is connected to a Garmin NMEA 2000

compatible radio, and you initiate a man-overboard DSC

distress call from your radio, your Garmin chartplotter shows the

man-overboard screen and prompts you to navigate to the man-

overboard point. If you have a Garmin autopilot system

connected to the network, your chartplotter prompts you to start

a Williamson's turn to the man-overboard point.

If you cancel the man-overboard distress call on the radio, the

chartplotter screen prompting you to activate navigation to the

man-overboard location disappears.

Man-Overboard Distress Calls Initiated from the

Chartplotter

When your chartplotter is connected to a Garmin NMEA 2000

compatible radio and you activate navigation to a man-

overboard location, the radio shows the Distress Call page so

you can quickly initiate a man-overboard distress call.

For information on placing distress calls from your radio, see the

VHF radio owner's manual. For information about marking an

MOB, see

page

Position Tracking

When you connect your Garmin chartplotter to a VHF radio

using NMEA 0183, you can track vessels that send position

reports. This feature is also available with NMEA 2000, when

the vessel sends the correct PGN data (PGN 129808; DSC Call

Information).

Every position report call received is logged in the DSC list

(page

18).

Viewing a Position Report

Select Nav Info > Other Vessels > DSC List.

Digital Selective Calling