Introduction...........................................................................iPreface ...................................................................................... iProduct terminology used throughout this manual ......................... iProduct Registration ........................................................................ iUnit Overview ......................................................................1Packing List and Accessories ................................................ 1Installing the GDL 30/30A ...................................................2Mounting the GDL 30/30A............................................................. 2Connecting the Power Cable .......................................................... 2Connecting the GDL 30/30A to a Chartplotter .............................. 3Connecting the Audio Cable (GA 30A only) .................................. 3Mounting the GA 31 Antenna ......................................................... 3Turn on the GDL 30/30A................................................................ 4Subscribing to XM WX Weather and XM Radio ........................... 4Displaying Weather and Sea Surface information .......................... 5Preset Weather Displays.....................................................6Selecting a preset weather display........................................ 6To select a preset weather display: ................................................ 6Customizing the Preset Weather Displays ........................... 7The Weather Features .........................................................8Precipitation ............................................................................. 8NEXRAD........................................................................................ 8Cloud Tops ...................................................................................... 9Storm Cells ................................................................................... 10Lightning ...................................................................................... 11Hurricanes ..................................................................................... 12Atmosphere ........................................................................... 13Wind ............................................................................................. 13Pressure ......................................................................................... 14Fronts ............................................................................................ 16Sea Surface ............................................................................ 18Temperature .................................................................................. 18Wave Height ................................................................................. 18Wave Period .................................................................................. 19Wave Direction ............................................................................. 19Main Menu ..........................................................................20Weather Tab ........................................................................... 20Current .......................................................................................... 20Forecast ......................................................................................... 21Sea Surface ................................................................................... 22Forecast Map ................................................................................ 23Setup ............................................................................................. 24XM Tab .................................................................................... 25Information ................................................................................... 26Blink Codes ............................................................................ 27Weather-Related Broadcast Rates ....................................... 28GDL 30/30A Specifications .......................................................... 29GA 31 Antenna Specifications ...................................................... 29Software ................................................................................. 30Software Versions ......................................................................... 30Software License Agreement ............................................... 30FCC Compliance .................................................................... 31Product Safety and Regulatory Information ....................... 31Caution ................................................................................... 31Limited Warranty ................................................................... 32Index ...................................................................................33INTRODUCTION > TABLE OF CONTENTS