Arc is making a splash with investors as it wraps up deliveries of its limited edition $300,000 electric boat and eyes its next target: watersports. The Los Angeles-based electric boat startup, which designed, built and has now delivered a limited edition run of the Arc One, recently raised $70 million in a Series B round from a bevy of returning investors, including Eclipse, Andreessen Horowitz, Lowercarbon Capital and Abstract Ventures. New investor Menlo Ventures — specifically long-time partner and self-proclaimed boating enthusiast Shawn Carolan — also joined in.