Others may have recommendations that are more local to Anacortes and the nearby area. I will recommend Alison Mazon. She is out of Portland, but is well regarded up and down the entire West Coast (and farther). She travels frequently as far south as San Diego, and as far north to Anacortes and (at east as well). Around Portland, she is legendary.
Personally, I don't think you can do better if you want someone impeccably thorough and honest.
As for knowing Ranger Tugs, she knows ours, at least.
Before we began working with her, she was recommended to us by several harbormasters/boat yard masters in the Portland area. Now that we have boating though the summer in the Portland area, we have run into more people than we can name or count who know her and have worked with her. None has even a remotely negative thing to say. She is the guru around here.
Just know this: she won't pull any punches, and she is a demanding surveyor. If you want someone to tell you what you most want to hear (whether you are a seller or a buyer), she's not the surveyor to go to. She will see the problems if they are there, and tell it like it is. On the flip side, she also recognizes quality construction too, and will praise highly when high praise is due.
Her contact info:
Alison Mazon
A. Mazon & Associates
1425 N. Marine Dr., Suite B
Portland, OR 97211
503-286-4252
http://www.alisonmazon.com
-- Gini