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It is able to calculate speed continuously. It can also set current position and target position. The watch will then calculate the direction and distance to the target position. I am not sure about how useful or applicable this watch is for trekking. I'll surely be very interested if it can serve this purpose well.
Among other functions, it can also display GMT time and times in different cities. The charging takes about 2 to 3 hours. That is about the same as the time it takes to charge a mobile phone.
I'm really looking forward to a discreet looking, useful, and power efficient GPS watch.
Do point to the following Website for more detail:
http://www.casio-intl.com/news/2006/gpr_100.html