If your bike is a 2000 or 2001, there are two official maps. One map is for the stock can, the other is for an open can. Most bikes end up with a 2002 and later map, regardless of year. All these maps are a bit different. It's a little confusing. If you really want to be confused, you can look at the TuneBoy website and see all the different maps Triumph has out for TT600s and S4s. They are very specific in their applications, but for the most part, they work pretty well in various different bikes other than the original intention.
So, when the dealer tells you there are only two maps, what they mean is there are two official maps from Triumph intended for your bike. If it is a 2002 or later bike, there is only one. If it is an S4, there's only one.
Most of us ignored the official line and just loaded maps until one turned out to work the best. For TT600s, it's the 2002 and later map, and for S4s it's the California AI map. An interesting part of the California map is no ignition map hole around 3000 rpm. Some people have had good results from using the 2001 open can map in an S4, except it sometimes kills the clocks for reasons I'm not sure anybody ever figured out.
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