I have had SafeSea for the last 4 years. I only needed them once but it was 3 in the morning and my motor would not turn over. Called them (I was off of the South tip of Prudence). They dispatched out of Wickford, were at my boat in about 10 minutes and towed me back to my dock in Warwick Cove. Turned out to be nothing serious but I swear by these guys.
www.safesea.com