IFD540 and TruTrak - Rounding the turns?

However, I have seen folks talk about how the IFD can "round the corners" of turns when transitioning from one way point to the next so as to make tight turns easier.  However, when I was out trying a few flight plans and approaches, I noticed that I didn't see the candy-cane rounding out the corners of the turns, and the Trutrak flew exactly what was on the screen... it flew to the waypoint, and then as it passed over, it started the turn (in this case a pretty sharp 130 degree turn back, intercepted the course and flew it like normal.

I am very very new to using an IFD as well as flying with an autopilot, so please forgive my lack of experience. Is there some feature I need to turn on, or do something different when I am setting up the flight plan in the FMS to get the IFD to "round the corners" of the turns?

thanks!

From your description, it sounds like the 130 degree turn was the reason that you didn't round the corner.  As you said, though, the map showed exactly what was going to be flown.

Which TruTrak are you using?

We have the Gemini AP in our Glastar and an IFD-540 and it works quite well. As others have noted, on larger turns it won't round it, but those aren't very common.

We used to have the old TruTrak ADI Pilot II and it wasn't as smart so it wasn't rounding the corners.

Jeremy

Yep, I was wrong about the 120.  I always get these two values mixed up...  On any course change greater than 135 degrees, the FMS will treat the waypoint as a flyover.  Normally, you'll get a waypoint alert 10 seconds prior to the start of the turn.  However, on course changes greater than 120 degrees, you'll instead get the alert 30 seconds prior.

I don't remember why/how we came up with the 135 value, but the 120 value is straight out of the regs (DO-229D MOPS).