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The hardest part is navigating through the thousands of ways to get it done. Outside of writing the check.
This is all going in Ralph the raffle plane. So it’s a blank canvas minus the Stratus Xponder with ADSB in and out.
It would be nice if I went Garmin GPS to be able to get traffic. But I plan on just using the iPad for that since the transponder won’t talk to anything Garmin I thought about just trading in with a shop, but I haven’t dug in that much about it yet.
OK, so as I posted above, we have similar panels. I have a glideslope on my MX300, though. If I wanted to spend the money once and get ILS functionality combined with GPS IFR capability, here's what I would do in your case.
Because you have a modern transponder, no need to change that.
I'd install a GNC 355 with some sort of indicator or tie-in to HSI (more on this later*). This would give you a modern Com and gps.
I'd go on ebay or elsewhere and get a ARC glideslope CDI and r-443b and connect it to the mx300. (not sure what model CDI you need, Ask an old school avionics guy)
https://www.ebay.com/itm/266927099679https://www.ebay.com/itm/266970279757You can do many options for the GPS indicator....one is find a used gi-106a or 106b ($800-1500, if lucky). Another option is to install a new gi275 as a MFD/CDI (but that's getting up in $$$).
Are there any ILS approaches around you? It may not be worth the effort to get glideslope.
A modern NAV/COM will be $4-5k for the transciever + install + CDI. A modern COM alone is $1500-2000.
*If you end up getting a gi275MFD, getting a GNX 375 will get you traffic in on your MFD and your ipad. You could sell/trade your stratus Xponder, but now you are back to just the MX300 only for a Com.
I've been through the various permutations on how to solve getting IFR GPS in my 150 and I can't really come up with anything less than $15,000-20,000 to do it right and make it worthwhile.
