The KLN-89 is a VFR GPS. The KLN-89B is A1 IFR approved. The IFR KLN-90B includes an ARINC-429 interface. The IFR KLN-94 is a slide-in replacement for the KLN-89B with a color display and additional dedicated buttons.
King KLN 94, KLN 89B, KLN 90B for sale on eBay
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