I could use some help with "Merlin" [View all]

I finally broke down and bought a *smart* phone,one of the main reasons was so that I could get Cornell's Merlin app.

I was under the impression that I could record a call and be able to identify the bird making the call using this app.

(Yeah, I'm not really a birder but I am working on it)
Any way, the recording is fine, you can see the pitch changes, but the response for an ID is Merlin has no matches.
Then it tries to put the blame on me, -"Merlin couldn't determine your location so some matches may be wrong. (After including a ZIP code.)

Any ideas?
THNX