HOUSTON (AP) — Cruise operators, like airline pilots, may be relying too heavily on electronics to navigate massive ships, losing the knowledge and ability needed to operate a vessel in the case of a power failure, an expert sea pilot told a federal agency on Wednesday.

Capt. Jorge Viso with the Tampa Bay Pilots testified before the National Transportation Safety Board on the second day of a two-day hearing the agency is holding after several high-profile cruise mishaps, including last year’s fire aboard the Carnival Triumph that left thousands of passengers stranded for days in squalid conditions aboard a powerless ship adrift in the Gulf of Mexico.