Ariane Design FMC : some clues

While we are waiting for the promised navdata (more than a year ago), i tried to re-use this aircraft. Despite its "black sheep" reputation, the Ariane B737 has some major qualities ; high-fidelity overhead and IRS, full hydraulic, electric managment, very good lights, extra views and a good framerate.
I checked the FMC and remind myself of the REF NAV DATA PAGE (via Init ref, Index nav data). Here you can create a missing waypoint or navaid which will help you (finally!) to draw a flight plan.

Example : i want to add the waypoint ALARO. I enter ALARO in key left_One (5 digits) and as the FMC cannot find it, a new page Ref Nav Data offers you to enter geographic coordinates in key left_3 and right_3. Here is the tricky part but its the same with many FMC : for 47°29'30N, you must enter N4729.3 and for 003°03'50E, it is E00303.5 and it works. The dot is figured by a button. Press Exec and that's it.
Try first with a fake waypoint (TEST1 here) beacause i did not find the way yet to delete the coordinates once written. It is registered in your navdata.dat in FSX&9\Ariane\Navdata\ (if you find the solution; indulge me). The good thing is that created waypoints will stay in the database.
In the legs, you can of course enter all relative waypoints needed in the usual way, by defining the navaid + heading / distance (example in San Jose CA : SJC130/15 put a point from VOR SJC at 130° heading and 15 nm). But that's common knowledge.

This article can be questioned/completed. it will be lately store in tips & tricks page.