E65 uses a NAVI01, NAVI02 or NAVI03

NAVI01 is similar to a Mk3

NAVI02 and NAVI03 are similar to Mk4

A lot of the nav is the same, but the graphic and menus are different, the LCD screen size is different, and the nav has a MOST fibre-optic interface.

The NAVI03 reads the same maps as a Mk4.