T-World Function. This is the name for the Navigator 3000's multiple time zone mode. The Navigator 3000 can track four additional time zones (in addition to the primary time zone, or the reference time zone, as Tissot calls it). One of the coolest features of this watch is the ability to swap out the reference time for one of the other four time zones. For example, you set your four additional time zones to the four places to which you are most likely to travel. When you arrive in a different time zone, rather than resetting the time on your watch, you simply select the new time zone, and swap it out for the reference time zone. When you travel back home, just swap the two time zones again. The Navigator 3000 can also be configured to display the offset between your different time zones and your reference time zone as opposed to displaying absolute times. Very sophisticated and comprehensive. DST support. All of the 150 preprogrammed cities also have DST setting preprogrammed up to the year 2099. If you create a custom city, you can manually configure the DST settings, as well. View the Tissot Navigator 3000 photo album.The Tissot Navigator 3000 is the newest in Tissot's line of "Touch Screen" watches. The Touch Screen collection is comprised of four watches (the T-Touch, the High-T, the Silen-T, and the Navigator 3000) which are primarily operated by touching the sapphire crystal in various locations as opposed to pushing buttons.All four of the Touch Screen watches are dramatically different. The High-T is an MSN Direct SPOT watch, the Silen-T is a more formal timepiece, and the T-Touch is made for hiking and other outdoor activities. The Navigator 3000, in contrast, is primarily a travel watch. The origins of the Navigator 3000 go all the way back to 1853 when Tissot created a pocket watch capable of displaying multiple time zones. 100 years later came the original Tissot Navigator multiple time zone watch, and most recently, the Tissot Navigator 3000 with several new and very advanced features: Touch screen technology. The Tissot Navigator 3000 has only one button which you use to activate the touch crystal. Once activated, you interact with the watch almost entirely by touching the crystal in different locations, and for different durations. Multiple display languages. The Navigator 3000 can be configured to operate in one of six different languages: French, English, German, Spanish, Italian, and Portuguese. Multiple time zones. The Navigator 3000 is a travel watch, and allows you to track multiple time zones simultaneously (more on this feature below). When you first receive the watch, you will want to set it to your home time zone which you do by first selecting your continent, then your country, and finally your city. The watch comes with 150 cities preprogrammed, but if yours is not included, you can manually add a custom city.