As part of the “all in one” concept:

In addition to the messaging and navigation features, it also includes a high quality diving computer (RGBM based).
The dive computer allows users to pre-plan a dive, or simulate a dive on a PC or on the UDI unit.

UDI unit offers all of the advanced features of the RGBM model, the leading technology developed and approved by Dr. Bruce R. Wienke.
Divers can use any EAN mixture, altitude corrections, multiple dives, deep stops options and many additional features.