It is possible to upgrade from P/N: 069-01034-0101 to P/N: 069-01034-0102 (with DC Roll Steering) via a software update.
The KLN-94 is an update to King's very common KLN-89B IFR-Approach Capable GPS.
Imagine calling the police and hearing “I was just thinking about calling you.” Those were the words I heard a few days ago when I phoned the California Highway Patrol (CHP).
Fortunately, I wasn’t being investigated for a crime!
Thus, the second RNAV approach to the same runway is labeled “Y.” Where you have Y and Z approaches to the same runway, usually the Z approach has precision LPV minimums and the Y approach has higher LNAV minimums.
In rare cases, for example at the Nut Tree Airport in Vacaville, Calif., the Y approach is for LPV minimums and the Z approach is for LNAV minimums.” has a full chapter devoted to flying GPS approaches with the Bendix/King KLN 94.
It was done with a new AFMS (approved flight manual supplement) for a KLN94 GPS in a US registered Socata TB20GT aircraft The KLN94 The Honeywell (formerly Bendix-King) KLN94 is a good basic IFR GPS which does everything operationally relevant to flying IFR around Europe.