Just for an update.
Got a spare control head from phiggins.
It did not appear at first to
work (no beep when powered on) so I swapped the
compass in it for the one from mine. Put 'em both back together and lo and behold, they both powered on and both appear to
work (in calm seas, anyway).
It's a miracle ' cause I don't understand it.
Ruffian, thanks for the offer. If things go wonky again I'll get in touch.
Morgan Paul, thanks for the enbay notification.
Connemara.