Tflhndn
Pre-takeoff checklist
Having a second VOR based RNAV box is a pretty good idea, though they do not seem to be common.
Not only is it not common, but I have gotten laughed out of two avionics shops for saying I wanted an RNAV installed when I do my major panel upgrade this year (converting to a center stack and adding WAAS GPS/ ADS-B)
A KNS 80 may be a bit big, but where else can you get a nav radi on with GS and DME for under $1000?
I don't plan to us it much, but it sure does make a great backup for the GPS IMHO