Garmin GPSMAP 225 Technical Reference
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Garmin GPSMAP 225 Technical Reference

Garmin gpsmap 225: reference guide
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Technical Reference

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Summary of Contents for Garmin GPSMAP 225

  • Page 1: Technical Reference

    Technical Reference for Garmin ® NMEA 2000 Products ®...
  • Page 2 All rights reserved. Except as expressly provided herein, no part of this manual may be reproduced, copied, transmitted, disseminated, downloaded or stored in any storage medium, for any purpose without the express prior written consent of Garmin. Garmin hereby grants permission to download a single copy of this manual onto a hard drive or other electronic storage medium to be viewed and to print one copy of this manual or of any revision hereto, provided that such electronic or printed copy of this manual must contain the complete text of this copyright notice and provided further that any unauthorized commercial distribution of this manual or any revision hereto is strictly prohibited.

  • Page 3: Contact Garmin

    If you experience difficulty installing a NMEA 2000 network, or have other questions about NMEA 2000-certified Garmin devices, contact Garmin Product Support or a certified NMEA 2000 technician. In the USA, go to www.garmin.com/support, or contact Garmin USA by phone at (913) 397-8200 or (800) 800-1020.

  • Page 4: Table Of Contents

    Restoring Factory Default Settings ...18 GFS 10 (Garmin Fuel Sensor) ... Using Fuel-Flow Information With a Garmin Chartplotter or Marine Instrument Changing the Fuel Economy Source Using Fuel-Level Information With a Garmin Chartplotter or Marine Instrument Configuring Engine and Tank Information Troubleshooting Fuel Gauge Type ...20...

  • Page 5: Nmea 2000 Fundamentals

    Garmin uses NMEA 2000 micro connectors on units, sensors, and T-connectors that are compatible with other NMEA 2000 micro connectors, cables, and NMEA 2000-compatible devices. Garmin sensors may be packaged with a drop cable and a T-connector. Garmin displays may also include additional NMEA 2000 components (such as a power cable).

  • Page 6: Nmea 2000 Components

    Garmin NMEA 2000 drop/backbone cable. ** The gray in-line lightning arrestor is designed to help prevent damage due to nearby lightning strikes, but it is not able to protect against direct lightning strikes. Garmin is not responsible for lightning-strike related damage.

  • Page 7: Building A Nmea 2000 Network

    Power connection and distribution (page • Proper termination (page • Cable length and device limits (page Technical Reference for Garmin NMEA 2000 Products Marine instrument Ignition or in-line switch Fuse Battery - 12 Vdc Power cable Backbone extension cable NMEA 2000 backbone...

  • Page 8: Linear Backbone Construction

    Male Backbone extension cable terminator Correct Linear Backbone Construction To NMEA 2000 devices and power T-connector installed incorrectly Male terminator Male Backbone extension cable (also installed terminator incorrectly) Incorrect Linear Backbone Construction Technical Reference for Garmin NMEA 2000 Products...

  • Page 9: Power Connection And Distribution

    Be sure to ground the NMEA 2000 power cable. Connect the bare shield-drain wire to the same location as the ground (black) wire. The Garmin NMEA 2000 power cable connects to a T-connector like other drop cables. Be sure to connect the NMEA 2000 power cable to the top of a T-connector;...
  • Page 10 LEN = 7 Drop cable Drop cable Length = 6 m Length = 6 m Backbone cable Length = 0 m Cable Cable Distance Distance Network load Network load resistance resistance Technical Reference for Garmin NMEA 2000 Products...

  • Page 11: Proper Termination

    Note: The in-line terminator connects to the NMEA 2000 backbone with a male connector, and to the final NMEA 2000 device with a female connector. Because of this, you can only use one in-line terminator on a NMEA 2000 network. Technical Reference for Garmin NMEA 2000 Products To NMEA 2000 devices...

  • Page 12: Cable Length And Device Limits

    No more than 50 NMEA 2000 devices can be connected to your NMEA 2000 network. Existing NMEA 2000 Installation Considerations If your boat has an existing NMEA 2000 installation, and you would like to add Garmin NMEA 2000 equipment, there are a few things to consider: Cable type: Garmin uses NMEA 2000 micro connectors for all cables and connectors.

  • Page 13: General Nmea 2000 Data Type Requirements

    Distance to Waypoint Off Course Desired COG Heading Course Over Ground (Continued) Technical Reference for Garmin NMEA 2000 Products PGN Data Required 127489 - Eng Dynamic 127489 - Eng Dynamic 127489 - Eng Dynamic 127489 - Eng Dynamic 127488 - Engine Rapid...
  • Page 14 • Wind Sensor, a Water Speed Sensor, a Heading Sensor, and a GPS Antenna • Wind Sensor and a GPS Antenna • Wind Sensor and a Water Speed Sensor, and a Heading Sensor Technical Reference for Garmin NMEA 2000 Products...
  • Page 15 Maximum Apparent Wind Speed Maximum True Wind Speed Opposite Tack Heading (Continued) Technical Reference for Garmin NMEA 2000 Products PGN Data Required 130306 - Wind Data, 129026 - COG/SOG, 129029 - GNSS Position, 127250 - Vessel Heading, and 128259 - Water Speed...
  • Page 16 None Typical Sender Depth Transducer Water Temperature Sensor Water Speed Sensor GPS Antenna, Water Speed Sensor, and Heading Sensor GPS Antenna, Water Speed Sensor, and Heading Sensor GPS Antenna GPS Antenna None None Technical Reference for Garmin NMEA 2000 Products...

  • Page 17: Nmea 2000-Certified Display Device Pgn Information

    All data transmitted on a NMEA 2000 network are organized into groups. These groups are identified by a Parameter Group Number (PGN) that describes the type of data contained in the group. All Garmin NMEA 2000 devices use the proprietary PGN numbers 126720 and 61184.

  • Page 18: Gmi 10

    130312 Temperature 130313 Humidity 130314 Actual Pressure Transmit 059392 ISO Acknowledgment 059904 ISO Request 060928 ISO Address Claim 126208 NMEA - Command/Request/Acknowledge Group Function 126464 Transmit/Receive PGN List Group Function 126996 Product Information Technical Reference for Garmin NMEA 2000 Products...

  • Page 19: Nmea 2000-Certified Sensor Pgn Information

    NMEA 2000-Certified Sensor PGN Information The following tables list the non-proprietary PGN information for every available Garmin NMEA 2000-certified sensor. GPS 17x (GPS Antenna) Transmit 059392 ISO Acknowledgment 060928 ISO Address Claim 126208 NMEA - Command/Request/Acknowledge Group Function 126464 Transmit/Receive PGN List Group Function...

  • Page 20: Gws 10 (Garmin Wind Sensor)

    Transmit/Receive PGN List Group Function 126996 Product Information 127250 Vessel Heading 127488 Engine Parameters - Rapid Update 129025 Position - Rapid Update 129029 GNSS Position Data 129284 Navigation Data 129285 Navigation - Route/WP information Technical Reference for Garmin NMEA 2000 Products...

  • Page 21: Gxm 51

    NMEA Request/Command/Acknowledge Group Function 126464 PGN List 126996 Product Information 129799 Radio Frequency/Mode/Power 129808 DSC Call Information Technical Reference for Garmin NMEA 2000 Products NMEA 2000-Certified Sensor PGN Information Receive 059392 ISO Acknowledgment 059904 ISO Request 060928 ISO Address Claim 126208...

  • Page 22: Nmea 2000-Certified Sensor Configuration Information

    Auto—the speed filter toggles on in low-speed situations and toggles off in high-speed situations. Refreshing GPS Satellite Acquisition In some situations, if you have moved the boat many miles without using the GPS 17x, for example, you can force the GPS 17x to re-initialize and find your current position.

  • Page 23: Gfs 10 (Garmin Fuel Sensor)

    Using Fuel-Flow Information With a Garmin Chartplotter or Marine Instrument CautioN: The Garmin chartplotter or marine instrument must be powered on to calculate remaining fuel based on the fuel-flow rate. important: When using the GFS 10 to calculate remaining fuel based on the fuel-flow rate, you must specify the amount of fuel each time you add fuel to the tank.

  • Page 24: Configuring Engine And Tank Information

    Troubleshooting Fuel Gauge Type When wired to a fuel gauge, the gauge type defaults to Auto Detect. If the fuel-level reading on your Garmin chartplotter or marine instrument changes with the engine RPM, the GFS 10 could be detecting the wrong type of gauge.

  • Page 25: Intelliducer (Intelligent Depth Transducer-Transom Mount And Thru-Hull)

    If you are measuring up to the water line (Intelliducer installed on the keel), enter a (-) negative number. Intelliducer at the water line Technical Reference for Garmin NMEA 2000 Products Enter a (+) positive number to show depth at the bottom of the keel.

  • Page 26: Gws 10 (Garmin Wind Sensor)

    Auto—automatically adjusts the filter settings based on wind conditions. Configuring the GWS 10 if the Filter and Offset Selections Are Not Displayed Depending on the version of software loaded on your Garmin marine instrument, the specific configuration options may not be displayed on the configuration screens.
  • Page 27 3. Follow the command with a number between 0 and 254, representing a time constant in increments of 0.25 second, or 255 to represent the Automatic setting (for example: SPEEDFILTER=215). Technical Reference for Garmin NMEA 2000 Products NMEA 2000-Certified Sensor Configuration Information...
  • Page 28 NMEA 2000-Certified Sensor Configuration Information Technical Reference for Garmin NMEA 2000 Products...

  • Page 29: Nmea 2000 Checklist

    Is the NMEA 2000 network backbone built using linear construction? Are there terminators on both ends of the NMEA 2000 network? Are all drop cables less than 20 ft. (6 m)? Technical Reference for Garmin NMEA 2000 Products NMEA 2000 Checklist (page...
  • Page 30 For the latest free software updates (excluding map data) throughout the life of your Garmin products, visit the Garmin Web site at www.garmin.com. © 2009 Garmin Ltd. or its subsidiaries Garmin International, Inc. 1200 East 151st Street, Olathe, Kansas 66062, USA Garmin (Europe) Ltd.

This manual is also suitable for:

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