"The ClearNav have done a better job than most at modernization"

This statement literally made me blow coffee out my nose.

I have flown with XCSoar, LXNav, LXNavigation and ClearNav systems, each has advantages and disadvantages. The CN system is "simple" to use and the vario coupled with the square display is superb, probably the best I have flown with so far. To call it modern however, is a far stretch. The user interface is straight out of a 1980's video game console as are the CGA graphics. ClearNav is essentially Glide Navigator II - Colour with updated tasking support.

Luke Szczepaniak