Just completed a wireless site survey using a MR36. Just wanted to post as I had to find the docs to do it but you can set the AP to Survey mode via its' on web page. Put the AP on a ladder with a PoE injector and moved it around and used Netspot to perform the survey.
We almost had to use a generator because there was not much power available at the site (new buildings).
Anyway just wanted to post if someone else needs to do this - worked great!