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Cheap IFR GPS (M3 approach ?) advice
Hi all,
I am toying with the idea of installing a "cheap" IFR GPS in my '76 Cardinal. Being admittedly a bottom-feeder in this area, my choices are basically limited to a used KLN89B, or the Northstar M3 Approach, something like a $1500 setup total. I don't think an avionics shop would touch anything like that for under $1000 in labor (can't really blame them, its probably *harder* to install than a latest generation unit), so I would be doing the work myself with an IA's assistance & signoff (and some begging at the FSDO). The M3 seems particularly attractive in this regard, because it is so simple to install when you use the MD40-64 indicator with built-in lights (no OBS, switching, etc). I also much prefer its interface to the older generation King units. My only concern is the near-term (say 3-5 years) availability of database updates for the M3, has anyone heard any rumblings about this ? Jepp seems to offer the Skybound II service for the Northstar right along the Garmins and Kings, but not sure what their policies have historically been about discontinuing updates. I should mention my primary motivation for wanting the GPS is flying direct without having to beg for fake vectors, and filing lower on airways with high MEAs that have considerably lower MOCAs. The approach capability is secondary, but since it just involves one extra annunciator light (at least on the Northstar), I'd try to get it certified. I do understand these first generation A1 units will be throwaway when the precision guidance becomes reality, that's OK, I am just looking for something I could put in cheap and use for the next 3-5 years. Thanks for any comments, particularly from current M3 owners or someone who has rolled their own (any brand). I think I have a pretty good understanding about all the things required to have the rig IFR-blessed (encoder interface, CDI, annunciators, COM interference testing, AFM supplement, etc.), so I am looking for war stories about the certification process itself when avionics shop wasn't involved. The IA is willing as long as the stuff has some basic pedigree paperwork (tagged, 337 sample, some continued airworthiness writeup). Thanks! Martin |
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