They're mostly buried down in the noise, but I'm making them out by ear after a minute or two of listening (and knowing what to expect at a given frequency, thanks to the "cheat sheet" on the website). The computer's analyzer helps a lot with locating them, as I can see that they're there visually before I can actually make sense of what I'm hearing down in the hash. I may think that I hear a beep or two around a spot on the dial where I expect to find something, but looking at the waterfall gives me an idea of what that frequency has been doing over the last few seconds, so I can spot trends better and figure out if there's really a beacon down in all that mud, or if it's just my ears playing tricks on me.
I'm new at this whole low-power beacon thing, so I figure it's just training for hunting entirely by ear later on.