There's a number of boat theft task forces set up in the SoCal area, and they work across jurisdictional lines.
And since we investigators are pretty few and far between, we mostly know each other and have worked together in the past.
Keith (boatPI) and I have done several operations together. And I know he's busted a few rings that lead him across 4 counties and 3 states to nab all the players.
Sorry to hear of your friends loss. If it was insured, have her tell the Insurance Company to get ahold of Todd or Keith at Todd and Associates. They've got a pretty good record for recovering stolen boats.