The UDI unit also comprises a data logger and a dive book.
 
The unit itself is capable of storing as many as 100 dives. 

Dives can be downloaded to a PC using the DiveSim™ software, provided with the unit (including the USB connecting cable), whenever it is convenient for you.

The software also lets you manage you dive log book, present its depth profile and the diving computer data at any time, in graphical form.