I know what you mean.
I'm not saying that source is reliable, it doesn't even specifically say fleet-boats used them. It's just the best I could do.
I don't know any good source(s) on that bit of info, but I'm pretty sure LukeFF does. And I'm definetly sure he's a more reliable source then Wiki.
Here would be a good place to ask this question:
http://www.subsim.com/radioroom/showthread.php?t=147577
If Davey says it's a fact, it's a fact.