No RNAV setting on Bendix/King DME
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According to the Caravan Professional manual, the Bendix/King KDI 572R DME receiver should display an RNAV option as part of the selector (according to the image). However, I haven't been able to get this to appear in my Caravan. I have set KX 155B selected as both Primary and Secondary avionics, and I ended the flight and exited the sim, and returned to find my avionics selections saved properly.
My guess is that maybe the image in the manual is incorrect, and copy/pasted from other Black Square manuals? All the data that I would expect to see on the DME display is, in fact, displayed on the KNS 80, and it seems to couple to the autopilot just fine in this configuration, so there's not an operational problem, just a discrepancy between the equipment behavior in the aircraft vs the manual.
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Screenshot added for clarity:

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The KDI 572R, with the R at the end there, is on those planes that have the KNS 81, namely Baron, Bonanza, and the Dukes. The planes that have the KNS 80, Caravan and TBM 850, instead have the KDI 572, without the RNAV on the DME.
@ploodovic That makes perfect sense and is what I sort of figured. I made the post mainly in case I was wrong, or in case the manual needs to be updated - it shows the wrong picture, making it a little confusing as to what the actual behavior should be.
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Took care of the manual. Thank you.