Visit the Garmin Web site (for current updates and supplemental information concerning the use and operation of this and other Garmin products. Garmin®, GPSMAP®, AutoLocate®, TracBack®, BlueChart®, and MapSource® are registered trademarks of Garmin Ltd. or its subsidiaries and may not be used without the express permission of Garmin. December 2006 Part Number 190-00665-00 Rev. B Printed in Taiwan IntroductIon > InstallIng Your gMr 21/41 and about thIs Manual IntroductIon This manual covers the features and operation of the GMR 21/41 marine radar when viewed on a Garmin marine network chartplotter. Installing Your GMR 21/41 To install your GMR 21/41, refer to the GMR 21/41 Installation Instructions included in this box. If you experience difficulty installing the radar, contact Garmin Product Support or an installation professional in your area. About This Manual To get the most out of your GMR 21/41, take time to read this manual and learn the operating procedures in detail. This manual is organized into the following sections. The Introduction sections contains the Table of Contents, Product Registration, and Software License Agreement. The Basic Operation section describes the features and operation of the GMR 21/41. The Appendix contains specifications, regulatory information, and maintenance information. You can also find warranty, European Licensing Requirements, and FCC information in the Appendix. An Index is provided at the end of the manual for reference. Manual Conventions This manual uses the term Warning to indicate a potentially hazardous situation, which, if not avoided, could result in death or serious injury. This manual uses the term Caution to indicate a potentially hazardous situation, which, if not avoided, may result in minor injury or property damage. It may also be used without the symbol to alert you to avoid unsafe practices. GMR 21/41 Owner’s Manual IntroductIon > table of contents Table of Contents Introduction...........................................................................i Installing Your GMR 21/41 ....................................................... i About This Manual ................................................................... i Manual Conventions........................................................................i Product Registration..............................................................iii Contact Garmin..............................................................................iii Software License Agreement ................................................ iii Warning ................................................................................... iv Important Information ............................................................ iv Basic Operation...................................................................1 Understanding Radar..............................................................1 Understanding the Radar Display...................................................2 Radar Page............................................................................... 3 Configuring the Radar Page............................................................ 3 Using the Radar Adjustment Menu ................................................ 4 Map Page Radar Overlay ........................................................ 9 Radar Tab ............................................................................... 10 General Sub Tab............................................................................ 10 Display Sub Tab............................................................................ 11 MARPA Sub Tab........................................................................... 12 Advanced Sub Tab........................................................................13 Appendix ............................................................................14 Specifications........................................................................ 14 European License Requirements ........................................ 15 Declaration of Conformity (DoC) ......................................... 15 Limited Warranty ................................................................... 16 FCC Compliance.................................................................... 17 Industry Canada Compliance...............................................17 Index ...................................................................................18 GMR 21/41 Owner’s Manual IntroductIon > Product regIstratIon and software lIcense agreeMent Product Registration Help us better support you by completing our online registration today! Connect to our Web site at Use this area to record the serial number (8-digit number located on the bottom of the GMR 21/41) in case your GMR 21/41 needs service. Keep the original sales receipt, or a photocopy, in a safe place. Serial Number: ___ ___ ___ ___ ___ ___ ___ __ Conta...