[joshuahedlund]

Yes, solid advice. Generally I find if I'm fairly close to the sound source, and it's repeating, it's almost always accurate, to a surprising degree (when I can confirm by sighting it); if it's a one-off call from farther away, especially of a rarer bird, it's often not. Merlin helps by printing a red circle next to rare candidates for your time/location, and I've learned to treat those with suspicion. I've definitely seen it get confused - once it kept pegging a Mallard when I was nowhere near water, and I finally figured out it was interpreting the jostling sound of lens caps in my bag as I walked that apparently resembled a quack!