GMR 20/40
Marine Radar
Owner’s Manual
© Copyright 2005 Garmin Ltd. or its subsidiaries |
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Garmin International, Inc. |
Garmin (Europe) Ltd. |
Garmin Corporation |
1200 East 151st Street, |
Unit 5, The Quadrangle |
No. 68, Jangshu 2nd Road |
Olathe, Kansas 66062, U.S.A. |
Abbey Park Industrial Estate |
Shijr, Taipei County, Taiwan |
Tel. 913/397.8200 or 800/800.1020 |
Romsey, SO51 9DL, U.K. |
Tel. 886/2.2642.9199 |
Fax 913/397.8282 |
Tel. 44/0870.8501241 |
Fax 886/2.2642.9099 |
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Fax 44/0870.8501251 |
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All rights reserved. Except as expressly provided herein, no part of this manual may be reproduced, copied, transmitted, disseminated, downloaded or stored in any storage medium, for any purpose without the express prior written consent of Garmin. Garmin hereby grants permission to download a single copy of this manual onto a hard drive or other electronic storage medium to be viewed and to print one copy of this manual or of any revision hereto, provided that such electronic or printed copy of this manual must contain the complete text of this copyright notice and provided further that any unauthorized commercial distribution of this manual or any revision hereto is strictly prohibited.
Information in this document is subject to change without notice. Garmin reserves the right to change or improve its products and to make changes in the content without obligation to notify any person or organization of such changes or improvements. Visit the Garmin Web site (www.garmin.com) for current updates and supplemental information concerning the use and operation of this and other Garmin products.
Garmin® is a registered trademarks of Garmin Ltd. or its subsidiaries and may not be used without the express permission of Garmin.
January 2005 |
Part Number 190-00457-00 Rev.A |
Printed in Taiwan |
INTRODUCTION
About This Manual
Congratulations, and thank you for choosing Garmin’s GMR 20/40 Marine Radar. The addition of the GMR 20/40 Marine Radar to your Garmin Marine Network, enhances the capability of your system by adding graphical radar data to your Garmin Marine Network.
This manual covers the features and operation of the GMR 20/40 Marine Radar when viewed on the Garmin Marine Network Chartplotters. To get the most out of your new radar, take time to read this manual and learn the operating procedures for your unit in detail.
Introduction: The introduction contains information about this manual and the Table of Contents.
Main Pages: The Main Pages contain information on the setup and operation of the GMR 20/40.
Appendix: TheAppendix contains information such as specifications, and license requirements. You can also find warranty and FCC information in theAppendix.
Index: Use the Index as a key word search to help you find information more quickly.
INTRODUCTION >ABOUT THIS MANUAL
Terminology used Throughout this Manual
•This manual refers to the radome hardware as the “scanner,” “Radar,” or “GMR 20/40.” These terms can be used interchangeably.
•This manual uses the term “chartplotter” when referring to a Garmin GPSMAP 3000 series Multi Function Display.
•This manual uses the term “Radar Page.” The Radar page is a dedicated page on the Garmin chartplotter showing radar information. Radar information can be displayed as a split screen on any of the chartplotter main pages.
•This manual uses the term “highlight” when referring to the onscreen cursor. To highlight something, use theArrow Keypad on the chartplotter to move the cursor to the desired item. The on-screen cursor is represented by changing the color of the highlighted box to yellow.
GMR 20/40 Owner’s Manual |
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INTRODUCTION > TABLE OF CONTENTS |
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Introduction........................................................................... |
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About This Manual................................................................... |
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Terminology used Throughout this Manual........................... |
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GMR 20/40 Operation.......................................................... |
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Radar Overview....................................................................... |
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The Radar Page....................................................................... |
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Radar Page Layout.......................................................................... |
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Range Rings.............................................................................. |
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Heading Line............................................................................. |
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Digital Navigation Data............................................................ |
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The Radar Configuration Page............................................... |
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The Radar Adjustment Menu.................................................. |
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Gain ................................................................................................ |
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Sea Clutter...................................................................................... |
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Rain Clutter..................................................................................... |
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FTC (Fast Time Constant).............................................................. |
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Zoom............................................................................................... |
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Target Expansion............................................................................ |
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Trails............................................................................................... |
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Guard Zone..................................................................................... |
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VRM/EBL..................................................................................... |
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MARPA......................................................................................... |
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MARPASetup ............................................................................. |
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Hide/Show Navigation Features................................................... |
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AdditionalAdjustment Menu Items ............................................. |
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Map Cursor On/Off....................................................................... |
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Setup............................................................................................. |
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The General Tab...................................................................... |
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The Display Tab...................................................................... |
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The MARPATab..................................................................... |
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TheAdvanced Tab .................................................................. |
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Enter Standby/Begin Transmitting............................................... |
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Map Page Radar Overlay...................................................... |
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Appendix............................................................................ |
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European License Requirements ........................................ |
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Specifications........................................................................ |
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FCC Compliance.................................................................... |
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Software License Agreement............................................... |
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LIMITED WARRANTY............................................................ |
22 |
Warning and Cautions .......................................................... |
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GMR 20/40 Owner’s Manual |
GMR 20/40 OPERATION
Radar Overview
The Garmin GMR 20/40 Radar Scanner transmits a narrow beam of microwave energy in a rotating 360° pattern. When the transmitted energy contacts a target, some of that energy is reflected and returned to the scanner. The scanner collects the returned energy for processing and display. The GMR 20/40 is operated and adjusted using the controls on your Gamin chartplotter. Radar data is presented on a dedicated Radar page, or as an overlay on the Map page.All radar controls are accessible on both pages.
The Radar Page
With the GMR 20/40 Radar properly installed, at power up, the Garmin chartplotter should detect the GMR 20/40 as a new network connection.
Note: A software update may be needed for the GMR 20/40 to function properly. If the message “Incompatible Software Version” is displayed when the chartplotter is powered on, the software in the chartplotter needs to be updated. A software update card is provided with the GMR 20/40.
GMR 20/40 OPERATION > RADAR OVERVIEW—THE RADAR PAGE
When the new radar is detected, the chartplotter automatically adds a dedicated Radar page to the page list. If the Radar page is not available, press and hold the ADJ/MENU key until the Main Menu is displayed. Using the ARROW KEYPAD, highlight the System tab, and select Radar from the Services list at the bottom of the page.
To Select the Radar page for display:
1.Press the PAGE key to display the Pages list.
2.Using the ARROW KEYPAD, select Radar.
3.Press the ENTER key.
Pages List
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GMR 20/40 OPERATION >THE RADAR PAGE
In the Status Bar at the top of the Radar page, the message “Radar Warming Up” is displayed with a countdown to Standby Mode. The countdown to Standby Mode is also displayed in the middle of the radar display. When the countdown reaches zero, the message “Hold FCTN to transmit” is displayed.
As a safety feature, the scanner enters Standby Mode after it is warmed up. This provides the operator an opportunity to verify that the area around the scanner is clear before beginning radar transmission. It is important to remember that the microwave energy transmitted by the scanner can potentially be dangerous.
Caution: The GMR 20/40 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 scanner is clear. The GMR 20/40 transmits a beam approximately 12° above and below a line extending horizontally from the center of the scanner. Avoid looking directly at the scanner as the eyes are the most susceptible part of the body.
When the area surrounding the scanner is clear, press and hold the FCTN key. The message “Do you want to begin radar transmission?” is displayed. Select Yes, then press the ENTER key. Before transmission begins, the message “Spinning Up” is displayed while the radar antenna reaches nominal rotation speed. When the message disappears, the radar begins painting an image.
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GMR 20/40 OPERATION > RADAR PAGE LAYOUT
Radar Page Layout
This section describes the features of the Radar page and how its features are displayed. By default, the Radar page displays a Status Bar along the top, user configurable Digital Navigation Data down the right side, a Heading Line, and Range Rings. Soft Key options that allow the user to quickly access functions and change settings may be displayed along the bottom of the page.
Status Bar
Range Rings 
Digital
Heading Line 
Navigation
Data
Zoom Scale
Soft Key Options
Ring Separation
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GMR 20/40 OPERATION > RANGE RINGS—HEADING LINE—DIGITAL NAVIGATION DATA
Range Rings
The Range Rings are used as an aid to quickly determine distance to a target. In the lower right corner of the display are two scales. The upper scale is the current zoom scale. This scale is changed using the RANGE keys. The Zoom Scale is represented by the Range Ring with tick marks around the circumference. The tick marks are arrange with a minor tick marks every five degrees and major tick marks
at thirty-degree increments. These tick marks can aid in quickly determining the azimuth to a target. The lower scale represents the distance between the Range Rings.
Heading Line
The Heading Line is shown from your current position along the path of your current heading.
Digital Navigation Data
By default, the Radar page shows one column of digital navigation data with four data fields. The Radar page can be configured to show two columns of data with up to seven data fields each. Each data field can be configured to show a variety of data.
3/4 nm
1/2 nm
1/4 nm
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GMR 20/40 Owner’s Manual |
GMR 20/40 OPERATION > THE RADAR CONFIGURATION PAGE—THE RADAR ADJUSTMENT MENU
The Radar Configuration Page
The Radar Configuration page is used to change the look of the Radar page. Please refer to the GPSMAP 3000 series Owner’s Manual for information on “Configuring the Main Pages.”
To display the Radar Configuration page:
Press and hold the DATA\CONFIG key.
The Radar Adjustment Menu
The RadarAdjustment Menu is a numbered list of options that allow direct access to the settings and features most commonly used on the Radar Page. There are several adjustment options available: Gain, Sea Clutter, Rain Clutter, FTC, Zoom, Target Expansion, Trails, Guard Zone, VRM/EBL, MARPA, and Hide/Show Navigation Features.All adjustments are made using theArrow Keypad, or Data Entry Keys.
Radar Adjustment Menu
Radar Configuration Page
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GMR 20/40 OPERATION > THE RADAR ADJUSTMENT MENU
continued
To change a Radar Adjustment Menu setting:
1.Press the ADJ key to display theAdjustment Menu.
2.Using the ARROW KEYPAD or DATA ENTRY keys, select an option. If using the ARROW KEYPAD to highlight an option, press the ENTER key to display the adjustment for that selection.
3.Using the ARROW KEYPAD, make the desired change, then press the ENTER key to accept the change.
Gain
Selecting Gain, displays the GainAdjustment Slider. When Auto is selected, the Scanner Gain is automatically adjusted to provide optimal performance.
To change the Gain setting:
1, Using the ARROW KEYPAD, move the slider up or down. 2. Press the ENTER key to accept the change.
To return the Gain setting toAuto, move the slider to the Auto position, or press the Auto Soft Key.
Sea Clutter
Sea Clutter is screen clutter caused by choppy sea conditions. Adjusting the Sea Clutter setting can help eliminate the screen clutter. Selecting Sea Clutter displays the Sea ClutterAdjustment Slider. The slider has three preset positions: Calm, Moderate, and Rough.
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