My concern is that it could give lifeguards a false sense of security, make them complacent unless they get an alarm. A fair amount of research has been done on

My concern is that it could give lifeguards a false sense of security, make them complacent unless they get an alarm. A fair amount of research has been done on that sort of thing, for example commercial airlines when autopilots started to become more sophisticated: It took a while and a lot of training of pilots to avoid a false sense of security.