Thanks for your kind words, it's a pleasure for us to provide CIVA to "simmers" willing to learn how it works.

Before answering your question I'd like to ask you one thing: The procedure to exit/enter TripleMix you described is wrong. It's actually the opposite: "MI4" means TripleMix is ENABLED, "MI5" means it is DISABLED, so if you command MI5 it will disable TripleMixing, if you command MI4 you're enabling it.

Now the question: Was it a typing mistake made by you or are you really performing the wrong procedure?

Also remember there is the EasyOn process involved in these phases, so it may take some time to "stabilize".

And Version 1.50 made EasyOn times more realistic (as from data provided from Gianfranco), text taken from history.txt file:

- Problem #0020 February 2007
 EasyOn transition speed used entering TripleMix and MI5 operation
 modes was too high. It has been lowered from about 2.5 NMs/h to 0.6
 NM/h to better reflect the way the real unit works.  

so they're now set to 0.6 NM per HOUR! If an INS position is just one mile off TripleMix calculated position it will take almost 2 hours to completely revert back to INU own displayed position.

Regards
Marco