Heard ex Navy bras on several channels and they say crashes are result of (1) lack of training in basic seamanship, (2) congress cutting budget for basic training on avoiding collisions in favor of technology, and (3) young sailors used to relying on technology and neglecting old fashioned radar and eyes plus lack of alertness on watch. They also note that there are many unreported near collisions even with technology-- so alertness and basic seamanship are critical to avoiding a collision-- and that takes training. Old ships-- civilian and Navy-- rely more on older radar and alertness and less automation, so fewer collisions