I briefly flew the aircraft with Altair (1973 ish) - recall a couple of trips around Barrow Island and one trip from Broome to Suai (Timor Leste). I was endorsed at Jandakot by the "noisy scrub bird" aka Bill Anderson (long since passed away).
Indeed it did have doppler and from memory the installation created a fairly aft CG. But it did work provided the ocean wasn't too calm.
It made a change from the Dove's and the Heron that we normally flew around Barrow and surrounding areas.
So long ago!