@JeeDee1955

I't good to have the Time Zone map updated if you travel to other time zones and want automatic correct time in your unit. The GPS unit uses UTC time from the satellites and needs an offset for current local time. The Time Zone Map helps to get the time offset from UTC depending on your current GPS location. It's just a few areas that have changed their Time Zone data so if you travel to those areas you may avoid to set the time adjustment manually if you update to the latest gmaptz.img.
This update is offered by Garmin WebUpdater if you use that to keep your unit up to date.

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