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The following lists of changes are based on information provided by GARMIN. Changes or improvements which we consider important or especially useful are shown highlighted.

To view the current firmware version, complete the following steps:

1. Connect the GPS18x to your PC.
2. Start the program nRoute.
3. Click on "Utilities".
4. Select "Get GPS Information..."
5. A pop-up window showing the current firmware version of the GPS18x will appear.

Each upgrade replaces the complete firmware in the GPS, which means you need to install only the version you wish to apply. There is no need to install any previous versions.

Changes made from version 3.20 to 3.30: (release date 10/27/2010)

1. Add PGRMID sentence to allow user programmable device ID.
2. Reversed sign of vertical velocity to be in ENU coordinates.
3. Fixed problem with almanac data not outputting.

Firmware Upgrade V3.30 (Self-extracting ZIP-file, 586 kB)

To table of contents

Changes made from version 3.10 to 3.20:

1. Modified proprietary binary output data format to fix incorrect date/time calculation on some Garmin marine products.

Firmware Upgrade V3.20 (not available for download)

To table of contents

Changes made from version 3.00 to 3.10:

1. Improved robustness of internal error handling.

Firmware Upgrade V3.10 (not available for download)

To table of contents

Changes made from version 2.90 to 3.00:

1. Fixed NMEA mode echo when the reset command is sent via PGRMI.

Firmware Upgrade V3.00 (not available for download)

To table of contents

Changes made from version 2.80 to 2.90:

1. Improved binary phase output and mode switching reliability.

Firmware Upgrade V2.90 (not available for download)

To table of contents

Changes made from version 2.70 to 2.80:

1. Fixed problem of unit not working above 60,000 feet.
2. Allow PPS to coast when fix is lost.

Firmware Upgrade V2.80 (not available for download)

To table of contents

Changes made from version 2.60 to 2.70:

1. Added map unlock support.
2. Fixed time field of PGRMI echo sentence to be UTC time.
3. GPS velocity performance improvements.

Firmware Upgrade V2.70 (not available for download)

To table of contents

Changes made from version 2.50 to 2.60:

1. Fixed field 7 of PGRMI input to properly reset unit.

Firmware Upgrade V2.60 (not available for download)

To table of contents

Changes made from version 2.40 to 2.50:

1. This version will clear all user settings.
2. Fixed problem with SBAS tracking.
3. Changed default DGPS mode to 'Automatic'.
4. Fixed formatting of GPVTG sentence.
5. Changed default RTCM baud rate to 4800.
6. Fixed automatic velocity filtering.

Firmware Upgrade V2.50 (not available for download)

To table of contents

Changes made from version 2.30 to 2.40:

1. Fixed 'number of satellites in use' field of GPGGA sentence.

Firmware Upgrade V2.40 (not available for download)

To table of contents

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