A. Make sure the GPS unit is set to GARMIN/GARMIN-host or Data Transfer-Slave mode depending on the unit.

Make sure the battery power is at 3/4 or higher.

Shut the GPS and computer off for 1 minute.

Turn the computer on. Do one of the following:

For MS-DOS 6x press F5 when you see "starting MS-DOS". You should then be at c:\prompt.
For Windows 95 press F8 when you see "starting Windows 95". At the menu, choose "safe mode command prompt only" (should be #6 or #7), You should then be at a c:\ prompt.

Turn on the GPS and put it into simulator mode.

Put the diskette is drive A, type "a:" and press enter. Type "updatedb" and press enter. The unit should update properly.

If you receive the message "Unable to Establish Communications with Unit" you may be experiencing one of the following:

1. Poor connection between GPS and computer.
2. Disabled or misconfigured com port.
3. Possible problem with GPS unit or cable.

If you continue to have problems, either try updating the GPS unit on another computer or call GARMIN technical support.