There’s one way to determine if a GPS approach in the KLN 94 is a Y or Z.

You must start to load the approach, inspect each of the waypoints displayed before the final button push to load the approach, and compare them to the waypoints in the instrument approach chart.

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The “Z” approach has LPV minimums of 300 feet and LNAV minimums of 680 feet; the latter would be used with the KLN 94, since it’s not WAAS-capable.

The “Y” approach has LPV minimums of 1202 feet and LNAV minimums of 1620 feet.

While they repair all other potential problems, the display on this GPS is not currently repairable or replaceable.

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.

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.

You’ll note that the first two waypoints, the IAF SABLO and the intermediate fix FESAV, are identical for both the Y and Z approaches.

You can scroll to see the missed approach waypoints, including the hold at POPES.

The most obvious improvement the KLN-94 offers is the color display / moving map.