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GMR 20/40
Marine Radar
Owner’s Manual
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© Copyright 2005 Garmin Ltd. or its subsidiaries Garmin International, Inc. Garmin (Europe) Ltd. Garmin Corporation st nd 1200 East 151 Street, Unit 5, The Quadrangle No. 68, Jangshu 2 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 Fax 44/0870.8501251 All rights reserved. Except as expressly provided herein, no
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INTRODUCTION > ABOUT THIS MANUAL Terminology used Throughout this Manual INTRODUCTION • This manual refers to the radome hardware as the “scanner,” “Radar,” or “GMR 20/40.” These terms can be used About This Manual interchangeably. Congratulations, and thank you for choosing Garmin’s GMR 20/40 • This manual uses the term “chartplotter” when referring to a Marine Radar. The addition of the GMR 20/40 Marine Radar to your Garmin GPSMAP 3000 series Multi Function Display. Garmin Marine Netwo
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INTRODUCTION > TABLE OF CONTENTS Setup ............................................................................................. 14 Introduction ...........................................................................i The General Tab ...................................................................... 14 About This Manual ................................................................... i The Display Tab ...................................................................... 15 Termin
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GMR 20/40 OPERATION > RADAR OVERVIEW—THE RADAR PAGE When the new radar is detected, the chartplotter automatically adds GMR 20/40 OPERATION a dedicated Radar page to the page list. If the Radar page is not Radar Overview available, press and hold the ADJ/MENU key until the Main Menu is The Garmin GMR 20/40 Radar Scanner transmits a narrow beam of displayed. Using the ARROW KEYPAD, highlight the System tab, microwave energy in a rotating 360° pattern. When the transmitted and select Radar
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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 As a safety feature, the scanner enters Standby Mode after it is Warming Up” is displayed with a countdown to Standby Mode. The warmed up. This provides the operator an opportunity to verify countdown to Standby Mode is also displayed in the middle of the that the area around the scanner is clear before beginning radar radar display. When the countdown reaches zero, the message “Hold transm
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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 Da
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GMR 20/40 OPERATION > RANGE RINGS—HEADING LINE—DIGITAL NAVIGATION DATA Range Rings Heading Line The Range Rings are used as an aid to quickly determine distance to The Heading Line is shown from your current position along the path a target. In the lower right corner of the display are two scales. The of your current heading. upper scale is the current zoom scale. This scale is changed using the Digital Navigation Data RANGE keys. The Zoom Scale is represented by the Range Ring By default, t
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GMR 20/40 OPERATION > THE RADAR CONFIGURATION PAGE—THE RADAR ADJUSTMENT MENU The Radar Configuration Page The Radar Adjustment Menu The Radar Configuration page is used to change the look of the Radar The Radar Adjustment Menu is a numbered list of options that allow page. Please refer to the GPSMAP 3000 series Owner’s Manual for direct access to the settings and features most commonly used on the information on “Configuring the Main Pages.” Radar Page. There are several adjustment options avai
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GMR 20/40 OPERATION > THE RADAR ADJUSTMENT MENU continued To change the Gain setting: 1, Using the ARROW KEYPAD, move the slider up or down. To change a Radar Adjustment Menu setting: 1. Press the ADJ key to display the Adjustment Menu. 2. Press the ENTER key to accept the change. 2. Using the ARROW KEYPAD or DATA ENTRY keys, select To return the Gain setting to Auto, move the slider to the Auto an option. If using the ARROW KEYPAD to highlight an position, or press the Auto Soft Key. option
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GMR 20/40 OPERATION > THE RADAR ADJUSTMENT MENU To change the Sea Clutter setting: FTC (Fast Time Constant) 1. Using the ARROW KEYPAD, move the slider to a preset or Adjusting the Fast Time Constant can help eliminate distant screen other position. clutter caused by rain. The Fast Time Constant has four presets: Off, 2. Press the ENTER key to accept the change. Low, Medium, and High. The preset positions can also be selected using the Soft Key options. To change the FTC setting: 1. Using
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GMR 20/40 OPERATION > THE RADAR ADJUSTMENT MENU Zoom Target Expansion When a Zoom level is selected, a box showing a zoomed portion Target Expansion increases the size of a target. Target Expansion has of the screen is displayed. When Move is selected, the ARROW two settings, On and Off. The Target Expansion setting has no effect KEYPAD can be used to move the box around the screen. The Zoom at range settings of 4 nm or greater. setting has four presets: Off, 2x, 4x, and Move. To turn Target
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GMR 20/40 OPERATION > THE RADAR ADJUSTMENT MENU Trails Guard Zone Trails are history trails that show movement of a target. When Trails A Guard Zone is a user defined area of protection. If a target enters is On, all returns on the display leave a history trail. The Trails setting the defined Guard Zone, an alarm is sounded. Two Guard Zones can determines the length of the trail. The Trails setting has four presets: be defined at any given time. Off, Short, Medium, and Long. The Guard Zone Menu
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GMR 20/40 OPERATION > THE RADAR ADJUSTMENT MENU The diameter of the VRM and the angle of the EBL are adjustable. To Define a Guard Zone: 1. Using the ARROW KEYPAD, highlight Show Guard Zone 1/2 To adjust the VRM/EBL: and press the ENTER key. 1. Using the ARROW KEYPAD, highlight Adjust and press the 2. Using the ARROW KEYPAD, highlight Adjust and press the ENTER key. ENTER key. 2. Press the ARROW KEYPAD right/left to rotate the Electronic 3. Using the ARROW KEYPAD, define the desired area on t
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GMR 20/40 OPERATION > THE RADAR ADJUSTMENT MENU To move the center location of the VRM: Acquiring Target 1. Using the ARROW KEYPAD, highlight Move and press the ENTER key. 2. Using the ARROW KEYPAD, move the center point of the Target is Safe VRM to the desired location. 3. Press the ENTER key to set the new location. To use the VRM/EBL, expand the diameter of the VRM so that the outer edge touches the target. Rotate the EBL until it intersects the Target is Dangerous VRM at the target locat
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GMR 20/40 OPERATION > THE RADAR ADJUSTMENT MENU While a target is being designated, a box is placed around the target. To display the MARPA List: When MARPA begins tracking the target, the box is replaced with the Using the ARROW KEYPAD, highlight MARPA List and press the ENTER key. appropriate symbol. Acquiring Target Tracking Target MARPA List MARPA Setup The MARPA Setup Menu contains settings for Vector Length, Target History, Own Vessel Safe Zone, Tine To Safe Zone, Safe Ring Zone, an
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GMR 20/40 OPERATION > THE RADAR ADJUSTMENT MENU Own Vessel Safe Zone—is a circular area defined by a range setting that is centered on your own vessel. If a target enters the defined area an alarm is sounded. The Safe Zone can be set to a distance between .01 and 2 nautical miles. Time To Safe Zone—sounds an alarm if MARPA determines that a target will intersect the Own Vessel Safe Zone within the defined time interval. The time interval settings range from 3 to 24 minutes. Safe Zone Ring—disp
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GMR 20/40 OPERATION > THE RADAR ADJUSTMENT MENU Map Cursor On/Off The Map Cursor On/Off setting turns the Map Page Cursor On or Off when operating in Split Screen Mode or when using two MFDs. To turn the Map Cursor On/Off: Using the ARROW KEYPAD, highlight Map Cursor On/Off and press the ENTER key. Setup Selecting Setup displays the Radar Setup Menu. The Radar Setup Menu contains four sub-tabs: General, Display, MARPA, and Advanced. The General Tab The General tab contains settings for Ori
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GMR 20/40 OPERATION > THE RADAR ADJUSTMENT MENU Front of Boat Offset—this setting is used to correct for any Timed Transmit STBY Time—this setting determines a time alignment error that may have occurred during installation of the interval in minutes that the radar is in stands by. For example, if set to scanner. The scanner is directional. For optimal performance it needs 10min, the radar stands by for a period of ten minutes before referring to be pointed directly ahead of the boat. To veri
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GMR 20/40 OPERATION > THE RADAR ADJUSTMENT MENU Center Offset—has three settings: Center, Look Ahead, and Auto The MARPA Tab Shift. Center places your current location in the center of the display. See MARPA Setup on page 12. Look Ahead shifts your current location toward the bottom of the The Advanced Tab display, allowing you to view an area farther ahead. Auto Shift adjusts AFC Mode—has two settings, Auto, and Manual. In Auto Mode the your location on the display according to the current
