Marine Instrumentation has been a Newport Beach mainstay for many years. It helps local boaters with numerous marine issues, though its major business is sales. It sells boats of all sizes, from quick, small trolling boats to full-size yachts and everything in between. It sells new boats from Parker, Pursuit and Yamaha Marine Engines, as well as a small selection of used boats. It also brokers yachts. Marine Instrumentation uses its sizeable boatyard in Costa Mesa for Yamaha engine and body repairs, as well as parts sales.