I bought this cheaply, the reason being that the beacons that used to send out a homing signal had been switched off some years before.
The seller thought it was then useless, I saw that it was in good condition and an up grade on the Lokata 5 RDFs I have had on my previous yachts.
Only the receiving side does not function, so the ear phones can be left in the box while the hand bearing compass can be used still.
The Lokata 5 had an internal re chargeable battery, the mount base was the charger, I have had two of those from new.
The Lokata 7 has four penlight batteries, which in some ways is better?
The set still works, this is many years after the set was produced, the elastic band is due to the battery box retaining clip having broken off.
I once met Christian, a Danish sailor, he had crossed the North Atlantic using only his RDF, he reasoned that once out in the Atlantic, RDF signals would be few and far between?
A really strong one was Ascension Island, so once locked onto that signal his DR was easy enough until he then picked up a second and a third beacon as he closed on the West Indies. Back then the Sat Nav was available but quite pricey, my friend saved himself the cost of the satnav this way.
We had the Walker 412 and had had the Walker 402 before then.