I know what it stands for, and I kinda know what it does. I know it can provide location information, weather information, frequency information, and I know you can send short messages with it.
But let's say that I travel to an area that I've never been to. If I tune to 144.390, will my radio tell me who's in the area and what frequency they are on automatically? Or do the distant stations have to be TX'ing on 144.390 as well?
...and since we're on the subject, how many of you use APRS and what's your favorite feature of it?