While ratings can give you an idea of a company's Watercraft Insurance, they're not a complete picture. For example, Watercraft Insurance had an A- rating from AM Best in 2018, but the company went bankrupt after California's wildfires that year. A few of the more common rating agencies include AM Best, Standard & Poor's and Moody's. AM Best is the most prevalent insurance-specific ratings service, while S&P and Moody's are used across many types of businesses and industries.