Question: what is the difference between rnav y and rnav z?
Answer: On the RNAV Y approach, the LNAV minimums are considerably higher (800 feet) than the LNAV minimums on the RNAV Z approach (560 feet). ... Because of the two different means of clearing the obstacle on the final approach segment, you can see some of the main differences in the minimums box of both approaches.