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I was introduced to boating at eight years old sailing a Sunfish on the Schuylkill River in Philadelphia, Pennsylvania. Since that early age I have spent my life as a boater and enthusiast of any activity on the water. My family summered in Beach Haven, New Jersey where I was introduced to saltwater fishing and the joys of powerboating on the local waters nearby.

I purchased my first boat at twelve years old with the help of my father. An older wooden runabout with a small Mercury outboard which we refurbished. It had the steering and throttle in the middle of the rear seating area and the passengers rode in the front. He would drive us to the Delaware River to take it out with my brothers. After growing up in Philadelphia and spending many summers on the Atlantic beaches of New Jersey-Barnegat Bay, Atlantic City, Long Island and surrounding waters my family moved to Bethesda, Maryland.

As a young teenager I attended summer camp on the Chesapeake Bay. The YMCA Sailing Camp polished my nautical skills and enlarged my marine education with Royce’s Sailing Illustrated for certification in their program and sailing Flying Scot’s. Summers on “The Bay” served as my foundation in boating. Safety on the water, knowledge and skills for a lifetime of boating.  I planned to spend time after High School sailing the intra-coastal waterway doing odd jobs in my custom designed live-aboard sailboat. That plan changed when I was encouraged by my father to enter college for an electrical engineering degree. So be it!

After graduating college in upstate New York (Clarkson University-Potsdam, NY-1978) with an engineering degree I entered the business world. Always near water if possible. I started my career on nuclear missile submarines at Newport News Shipbuilding (Newport News, VA), and boating around Virginia Beach-VA, the Great Dismal Swamp, and into the vicinity of Kitty Hawk-NC. Always a boat owner.

A resident of Sarasota, Florida since 1979.  Early on I introduced my family to sailing in an AMF Puffer (13 ft, sloop rigged), Our first sailboat. We spent much family time on the water in the Florida Keys and also around Sarasota Bay, Tampa Bay, the Gulf of Mexico and surrounding waters. I became involved in Opti pram sailing at the Sarasota Sailing Squadron-Youth Program with my youngest son who embraced the sailing world more so than the other two. Spent several years on the water as a leader in that program and safety boat as we traveled the state participating in competitions.  In 2012 I joined Bay Sailors of Tampa Bay-A Sailing Club to cruise the BVI’s on my first bareboat charter. After two trips to there, I skippered two more trips. One to Croatia (2016), and one to Greece (2017). I really enjoyed sailing on larger vessels and pursued certifications with the ASA-American Sailing Association. Achieving the IPC-International Proficiency Certificate with ASA gave me the credentials to be a bareboat skipper.

That interest continued with instructor qualification to teach ASA certifications. 
In 2014 I added a USCG Licensed Captain and 50 Ton Masters as well. In 2018 I added RPBA-Recreational Powerboat Association instructor qualification to teach their series of powerboating certifications.

In 2019 I started Florida Sailing and Powerboating School and Charters to bring my maritime career to a pinnacle. I also became a licensed Florida Boat Broker in 2019.

Certifications and Licenses
• USCG Licensed Captain-50 Ton Masters-May 2017
• Certified Instructor for ASA/RPBA to teach sailing and powerboating up to 70 ft length-2016 to current
• Florida Boat Broker-2019
• Private Pilot-SEL, Instrument Rated, Jet Aircraft SIC, High Performance, and High-Altitude Endorsement
• Scuba Diver-PADI Certified 1978-Advanced Open Water, Tech I Deep Water-2017

Business Related
• Owner and CEO of Mar Adentro Marine and Charter Services, LLC established March-2017
• Owner and Head Instructor-Florida Sailing and Powerboat School and Charters-Affiliate School 882 for the ASA-Established February 2019

Organizational Affiliations
• Vice Commodore-Bay Sailors of Tampa Bay-A Sailing Club-2017 to 2019
• Commodore-Bay Sailors of Tampa Bay-A Sailing Club-2019 to 2020
• Member-Sarasota Sailing Squadron 

Captain Michael B. Yonker

USCG Licensed Captain-50 Ton Masters
ASA Certified Instructor
RPBA Certified Instructor
Licensed Florida Yacht and Ship Broker


Mar Adentro Marine and Charter Services, LLC.
2001 Whitfield Park Ave.
Sarasota, FL 34243


Phone: 941.500.2485
Office: 941.758.7500
Fax: 941.758.7556

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