Well in my particular case, the radio I'm replacing is a narco with a narco
glideslope head that won't work with my other nav/comm (a KX-175B). So I'd
have to buy two heads if I wanted to fly a precision approach: one for the
new GPS, and one with a glideslope needle (I DO have a KI201C currently on
my KX-175B but, even if that would work for the GPS, I'd still need to buy
the annunciator, etc). I opted to buy just one head with a glideslope
needle and share it between the GPS and my nav/comm. En route, I certainly
wouldn't be using both at the same time, and I couldn't think of any
approach situations where I'd need a CDI for both. If you're not in this
particular situation then yes, it makes better sense to buy the MD-41
combination.

mark


Mark:

With your setup, if you want to use MD-41, you still need a KN-72 converter to
convert KX-175B's composit NAV to right-left for MD-41, and you would not have
GS nuless you also get a KN-75 GS receiver.

If you want to share a CDI for both KX-175 & GPS, KI-209A is your best choice
because KI-209A has built-in converter & relay switching for GPS/NAV signals.
You still need a GS receiver like KN-75 to get ILS, and annunciators/switches
to control GNC300's arm, hold functions as well as switching KI-209A between
GPS/NAV signal by grounding a wire from KI-209A.

All these extra hardwares and installation make GNS430 a batter and not much
more $ choice. Been there & done that with KX-125, KN-75, Trimble 2000,
KI-209A, and MD-41 (I get GPS on both KI-209A & MD-41). I did my own
installation so I saved by using used first gen GPS, but if I need to pay
someone to install for me, GNS430 with single CDI will be my choice.

Robin Hou