http://www.garmin.com/support/downlo...ils.jsp?id=885
changes made from version 4.40 to 4.50:
• Corrected issue in previous software revision that could cause some unit settings to be restored to defaults.
• Corrected issue in previous software revision that could prevent the time zone from being changed.
• Corrected issue that could cause the odometer field value to become inaccurate.
• Corrected occasional unit shutdown during powerup.
• Improved address search when using postal codes.
• Updated text translations.