Join Date: Jun 2005
Location: New Orleans
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Well, both ASA and USSA have programs to certify instructors, check their web sites. Looks like they require time, travel, and money. I might think about it when I retire, but til then I've been teaching part time on occasion without one (though I do have the USCG license), and have since high school and college, long before there were any certifying agencies.
Some sailing schools/programs want to see these certifications (or may want you to commit to getting one within a year after employment, some don't as long as they like your resume, personality, and teaching style.
If your wife has the experience, she may have the qualifications, even if not the actual certificate. I think most of the club-based programs use instructors they know, most without any certification. But the commercial schools (Steve Colgate, J-World, and the like) mostly use instructors with certificates, I think.
I guess it depends what kind of teaching program she's thinking of..