How do you encode a radial to radial turn in ARINC-424?
So you fly the KEA transition like this:


Track RDL 265 KEA until crossing RDL 187 ATV or 27 DME KEA
Start a right turn and intercept RDL 192 ATV
Fly RDL192 until intercepting final


As egid said, RDL 187 ATV is a lead radial which is a radial used only to tell you when to start a turn.

As far as 20 DME ATV, it is actually only used for the PELAG transition so you can ignore it in this case.