The GP30 is a recent Blunami4408 install (was described in OGRR magazine RUN332. The RC crane has two can motors controlling the boom and hook. The transfer caboose contains a 48MHz two channel receiver powered by AA cells which controls the boom and hook. The Blunami app controls the loco and a handheld controller operates the crane car boom and hook. Currently looking into using a Blunami to operate the crane boom and hook in order to use the app for both control functions.