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Introduction

 WARNING

See the 

Important Safety and Product Information

 guide in the 

product box for product warnings and other important 

information.

Device Configuration

NOTE: 

Certain functions are available only when the 

appropriate sensors are connected to the device.
The GNX 20 Marine Instrument with Standard LCD or the GNX 

21 Marine Instrument with Inverted LCD allows you to view data 

provided by sensors connected to the device using a NMEA 

2000® or NMEA® 0183 network.

Select to return to the previous menu or to the instrument 
page.
Select to view the menu for an instrument page.

 or 

Select to scroll through instrument pages and menus.
Select to view the display settings.
Select twice to view backlight settings.
Hold to view the power off settings.

Using the Race Timer

You can use the race timer to count down to a race, and then 

measure the duration of the race. You can add the race timer as 

a data field on a page.

TIP: 

To quickly open the race timer screen, hold 

 from a main 

page.

1

From a page with the race timer active, select 

 > 

CONFIGURE DATA FIELDS

 > 

RACE TIMER SETTINGS

.

2

Select an option:
• When the device is in prerace mode and is stopped or 

running, select 

RESET

START

, or 

SETUP

.

• When the device is in prerace mode and is running, sync 

the timer to the next minute up or the next minute down, 

or select 

STOP

.

• When the device is in race mode and the race timer is 

counting up, sync the timer back to 0:00, or select 

STOP

.

Profiles

Profiles are collections of instrument pages that can be 

customized. Profiles can be made up of instrument pages that 

display similar data, such as GPS speed information and GPS 

course information.

During the initial setup, you can select a preset profile, or you 

can create a custom profile. You can select a different profile at 

any time.

POWERBOAT

: This profile displays instruments useful when in 

a powerboat. Available default instruments include GPS 

speed information, GPS course information, depth, bearing 

to waypoint, distance to the next waypoint, and water 

temperature.

SAIL CRUISE

: This profile displays instruments useful when 

cruising in a sailboat. Available default instruments include 

true wind speed, GPS speed information, GPS course 

information, bearing to waypoint, distance to the next 

waypoint, true wind angle, and depth.

SAIL RACE

: This profile displays instruments useful when 

racing in a sailboat. Available default instruments include 

GPS speed information, true wind speed, true wind angle, 

heading, bearing to waypoint, and distance to the next 

waypoint.

CUSTOM

: This profile allows you to customize the page to 

display instruments useful to your specific boating needs. 

The default page displays speed over ground information.

Selecting a Profile

1

Select 

 > 

SETUP

 > 

PROFILES

.

2

Select a profile.

Restoring Profiles to their Default Settings

You can restore profiles to their factory default settings.

1

Select 

 > 

SETUP

 > 

PROFILES

 > 

RESET DEFAULTS

.

2

Select 

CURRENT PROFILE

 or 

ALL PROFILES

.

Instrument Pages

Cycling Through Instrument Pages

From the home page, select 

 or  .

Using Auto Scroll

You can use auto scroll to automatically cycle through all of the 

instrument pages.

1

Select 

.

2

Select 

SETUP

 > 

AUTO SCROLL

.

3

Select how long each instrument page displays.

Configuring the Data Fields

Data provided on an instrument page can be shown in various 

ways depending upon the instrument page that is displayed.

Select 

 > 

CONFIGURE DATA FIELDS

.

Configuring Graph Data Fields

Some instrument pages display graph data. You can configure 

the data that displays on the graphs.

1

From the instrument page, select 

 > 

CONFIGURE DATA 

FIELDS

 > 

GRAPH SETTINGS

.

2

Select an option:
• To determine how long the graph data displays, select 

GRAPH DURATION

.

• To configure the scale of values displayed in the graph, 

select 

GRAPH SCALE

.

Changing the Layout of Instrument Pages

NOTE: 

Instrument page layout can be changed only on pages 

that display more than one instrument.
You can change the layout of instrument pages to display up to 

three instruments from any category.

Introduction

1

Summary of Contents for GNX 20

Page 1: ...GNX 20 21 Owner s Manual February 2014 190 01659 00_0B Printed in Taiwan ...

Page 2: ...n of such changes or improvements Go to www garmin com for current updates and supplemental information concerning the use of this product Garmin and the Garmin logo are trademarks of Garmin Ltd or its subsidiaries registered in the USA and other countries GNX 20 21 is a trademark of Garmin Ltd or its subsidiaries This trademark may not be used without the express permission of Garmin NMEA NMEA 20...

Page 3: ...ugh Instrument Pages 1 Configuring the Data Fields 1 Changing the Layout of Instrument Pages 1 Adding an Instrument Page 2 Removing an Instrument Page 2 Device Configuration 2 Resolving a Combined Network 2 System Settings 2 Display Settings 2 Viewing and Editing NMEA Settings 2 NMEA 0183 Data Type Information 3 Registering Your Device 3 Appendix 3 Data Fields 3 Index 4 Table of Contents i ...

Page 4: ......

Page 5: ... speed information GPS course information depth bearing to waypoint distance to the next waypoint and water temperature SAIL CRUISE This profile displays instruments useful when cruising in a sailboat Available default instruments include true wind speed GPS speed information GPS course information bearing to waypoint distance to the next waypoint true wind angle and depth SAIL RACE This profile d...

Page 6: ...time format time zone and daylight savings time for your location SYSTEM INFORMATION Displays software information FACTORY DEFAULT Resets the device to factory defaults Selecting the Heading Type 1 Select SETUP SYSTEM HEADING 2 Select NORTH REFERENCE 3 Select an option To automatically set the magnetic declination for your GPS position select MAGNETIC To set true north as the heading reference sel...

Page 7: ...LV The altitude of your current location above or below sea level ERR The precision of the current position when used with GPS GWD The direction of the wind relative to the ground referenced from the north GWS The speed of the wind relative to the ground HDG The direction the boat is pointing HUM The level of humidity MAX The maximum in relation to another data field For example maximum speed MIN ...

Page 8: ...2 H heading type 2 I instruments 1 adding pages 2 configuration 1 removing pages 2 N NMEA 0183 3 NMEA 2000 2 P pages 1 position format 2 product registration 3 profiles 1 restoring 1 selecting 1 R race timer 1 registering the device 3 S settings 2 system information 2 T timer 1 troubleshooting 2 4 Index ...

Page 9: ......

Page 10: ...5 00800 4412 454 44 2380 662 915 35 1214 447 460 386 4 27 92 500 0861 GARMIN 427 646 27 0 11 251 9999 34 93 275 44 97 49 0 180 6 427646 20 ct Anruf a d deutschen Festnetz Mobilfunk max 60 ct Anruf 46 7744 52020 Garmin International Inc 1200 East 151st Street Olathe Kansas 66062 USA Garmin Europe Ltd Liberty House Hounsdown Business Park Southampton Hampshire SO40 9LR UK Garmin Corporation No 68 Zh...

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