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Owner’s Manual
GMR 21/41
marine radar
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© Copyright 2006 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 21/41.” These terms can be used About This Manual interchangeably. Thank you for choosing Garmin’s GMR 21/41 marine radar. The • This manual uses the term “chartplotter” when referring to a addition of the GMR 21/41 marine radar to your Garmin Marine Garmin GPSMAP 3000 series multi-function display. Network, enhances the capa
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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 21/41 OPERATION > RADAR OVERVIEW—THE RADAR PAGE When the new radar is detected, the chartplotter automatically GMR 21/41 OPERATION adds a dedicated Radar Page to the pages list. If the Radar Page is not available, press and hold ADJ/MENU until the Main Menu is Radar Overview displayed. Use the Rocker to highlight the System tab, and select The Garmin GMR 21/41 transmits a narrow beam of microwave Radar from the Services list at the bottom of the page. energy in a rotating 360° pattern
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GMR 21/41 OPERATION >THE RADAR PAGE When the scanner is powered on, the Status Bar at the top of the As a safety feature, the scanner enters standby mode after it warms Radar Page, shows the message “Radar Warming Up” with a up. This provides the operator an opportunity to verify that the area countdown to Standby Mode. The countdown is also displayed in around the scanner is clear before beginning radar transmission. It is the middle of the Radar Page. When the countdown reaches zero, the i
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GMR 21/41 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 quick access to radar functions and setting changes are displayed along the bottom of the page. Status bar Range rings Digital Heading line navigation data Zoom
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GMR 21/41 OPERATION > RANGE RINGS—HEADING LINE—DIGITAL NAVIGATION DATA Range Rings Heading Line The Range Rings help to quickly determine the distance to a target. In The Heading Line is shown from your current position along the path the lower-right corner of the display are two scales. The upper scale of your current heading. is the current zoom scale. This scale is changed using the RANGE Digital Navigation Data keys. The zoom scale is represented by the Range Ring with tick By default, t
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GMR 21/41 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 allows 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 about “Configuring the Main Pages.” Radar Page. There are several adjustment options
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GMR 21/41 OPERATION > THE RADAR ADJUSTMENT MENU To change a Radar Adjustment Menu setting: To change the Gain setting: 1. Press ADJ/MENU to display the Adjustment Menu. 1, Use the Rocker to move the slider up or down. 2. Use the Rocker or Data Entry keys to select an option. Press 2. Press ENTER to accept the change. ENTER to display the adjustment for that selection. To return the Gain setting to Auto, move the slider to the Auto 3. Use the Rocker to change the current setting. Press ENTER po
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GMR 21/41 OPERATION > THE RADAR ADJUSTMENT MENU To change the Sea Clutter setting: FTC (Fast Time Constant) 1. Use the Rocker to move the slider to a preset or other Adjusting the Fast Time Constant can help eliminate distant screen position. clutter caused by rain. The Fast Time Constant has four presets: Off, 2. Press ENTER 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. Use the Rocker to se
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GMR 21/41 OPERATION > THE RADAR ADJUSTMENT MENU Zoom Target Expansion When a Zoom level is selected, a window showing a zoomed portion of Target Expansion increases the size of a target. Target Expansion has the screen appears and a selection box is shown. The selection box can be two settings, On and Off. The Target Expansion setting has no effect moved to see different areas. The Zoom setting has four presets: Off, 2x, 4x, at range settings of 4 nm or greater. and Move. To turn Target Ex
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GMR 21/41 OPERATION > THE RADAR ADJUSTMENT MENU Trails Guard Zone When the Trails function is on, all returns on the display leave a A Guard Zone is a user-defined area of protection. If a target enters history trail. The Trails setting determines the length of the history the defined Guard Zone, an alarm is sounded. Two Guard Zones can trail. The Trails setting has four presets: Off, Short, Medium, and be defined at any given time. Long. The Guard Zone Menu has two areas, “Guard Zone 1” and “Gu
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GMR 21/41 OPERATION > THE RADAR ADJUSTMENT MENU The diameter of the VRM and the angle of the EBL are adjustable. To Define a Guard Zone: 1. Use the Rocker to highlight Show Guard Zone 1 or 2, and To adjust the VRM/EBL: press ENTER. 1. Use the Rocker to highlight Adjust and press ENTER. 2. Use the Rocker to highlight Adjust and press ENTER. 2. Press the Rocker right or left to rotate the Electronic Bearing 3. Using the Rocker, define the area on the Radar Page. Line around the center point of th
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GMR 21/41 OPERATION > THE RADAR ADJUSTMENT MENU performance. Each target being tracked by MARPA is represented by To move the center location of the VRM: 1. Use the Rocker to highlight Move and press ENTER. a symbol. The symbols indicate the current state of the target. 2. Using the Rocker, move the center point of the VRM to the selected location. Acquiring target 3. Press ENTER to set the new location. To use the VRM/EBL, expand the diameter of the VRM so that the outer edge touches the ta
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GMR 21/41 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 Use the Rocker to highlight MARPA List and press ENTER. appropriate symbol. MARPA List Acquiring Target Tracking Target MARPA Setup The MARPA Setup Menu contains settings for Vector Length, Target History, Own Vessel Safe Zone, Tine To Safe Zone, Safe Ring Zone, and Velocity Refe
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GMR 21/41 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 21/41 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 chartplotters. To turn the Map Cursor On or Off: Use the Rocker to highlight Map Cursor On/Off and press ENTER. 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 Orien
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GMR 21/41 OPERATION > THE RADAR ADJUSTMENT MENU Timed Transmit—is used to save power, likely while at anchor. The Display Tab When Timed Transmit is On, the radar refers to the settings in Timed The Display tab contains settings for Center Offset, Rings, Transmit XMIT Time and Timed Transmit STBY Time. If Off is Background color, Heading Line, Bearing Reference, and Navigation selected, the Timed Transmit XMIT Time and Timed Transmit STBY Features. Time fields are inactive. Timed Transmit XM
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GMR 21/41 OPERATION > THE RADAR ADJUSTMENT MENU Rings—is used to turn the radar Range Rings On or Off. The MARPA Tab See “MARPA Setup” on page 12. Background—is used to select a background color for the Radar Page. The options are Black, Blue, and White. The Advanced Tab Heading Line—is used to turn the Heading Line On or Off. AFC Mode—has two settings, Auto and Manual. In Auto mode the Bearing Reference—has two settings, Absolute and Relative. scanner frequency is automatically adjusted for
