I guess after making my map it is no longer accurate. The system is still doing it's thing and everyday it seems to be a little different. Pretty cool how it basically adapts to weather and fixes itself.That's pretty incredible ranges for sure, still amazes me. I have set some cams at 3/4 mile or so with a link level between 10-15, and it works, but, get a bunch of pics in queue, and you might have the occasional transmission issue. I'm not sure exactly what ambient conditions will affect the signal the most, but I've seen a cam with a low link level of 10 be over 20 on some days, so you'll see the link level vary. As you use the system, you'll start figuring out what works best on your property.
On the serial numbers...I don't have my new batch of L cams unpackaged yet, but on all my older units, there is a sticker, I think under the door, that has the serial number.
This is making me like technology again.