The big problem with seaplane instructors is that they are all so full of themselves

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Anybody who goes to Moose Piss, tell Vern Mike V said so

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Vern runs a good operation.
There are some good SES operations around the country. Kenmore Air used to run one of the best, but I have no experience with them lately so I don't know what they are like these days. They run a top notch operation in everything they do, though.
Here is something to consider, if you are thinking about a SES rating, though:
What sort of environment does the operator you are looking at work in?
Will you get a REAL diversity of experiences: Fast rivers, big lakes, REAL confined areas, docking, beaching, step turns, etc, etc.
Do the instructors who are teaching there have "actual" working seaplane experience, or are they simply last year's crop of graduates?
I taught SES in Fairbanks, AK for a number of years, and I ALWAYS got applicants into very swift rivers for that experience, and into a variety of situations as well. There aren't a lot of places you can do that. (I'm not there anymore, by the way).
If you go to Florida, say, for your float rating, you are going to short yourself, simply because there is not the variety of training opportunities in that part of the world. That is not intended as a reflection on the operators there, by the way, simply that it would not be my choice of someplace to go for a "real" float rating.
If all you want is a quickie $600 "vanity rating" special, there's lots of places that can do that.
Get one of those and buy your own seaplane and you're an accident looking for a site to happen.
Remember that opinions are like ummm.....never mind.
The point is, the only one that doesn't stink is my own

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For what its worth.
MTV