Mil-Viz has just confirmed that their Turbo Otter will support the Kingnav!

We have released a new update

Changelog v180502:
Updated to fix font alignment errors on certain setups.
Configuration utility updated to show NAV, COM & frequency checkboxes only when applicable to the chosen unit.

It looks like we have found a solution.

good idea Bernard,

we are reaching out to GA developers, and as they come on board we will update a list of supported aircraft

On test a user (simrussia) sees misaligned text. (latest build)

Good morning. I’ m having issues with My prepar3d v4 not starting if I install Navstax. I install it , then use the configuration app to stack my gauges the way I want , I select my aircraft ? 310 R. Then save settings , and exit. I then use the ? app to select which avionics package I want (Navsta...

The correct fonts have not been installed. Can you try installing again please?

It may be that you have inadvertently set it to 'TEST'.

At last after a hiccup or three, it is released!