Originally Posted by
Ironpot
The difference in cost between the 335 (Out only) and 345 (In & Out) is circa $6k
True, but that's assuming you have a compatible cockpit display. If they have a big-screen Garmin thingamabob then yep, that's about all it'd cost, plus installation. But as
Squawk7700 mentioned above, in the absence of that, you're talking biiiiig dollars to purchase and install something in a certified aircraft though there's a few new ones popping up for Experimental's in the sub-$2000 range, however even that is big bikkies for a lot of aircraft owners.