I don't think that's a fair assumption at all. There's a world of difference between being able to propel yoursellf versus relying on another vehicle when the e

I don't think that's a fair assumption at all. There's a world of difference between being able to propel yoursellf versus relying on another vehicle when the emergency may occur in rough seas or busy channels. Also the assisting tugboat would have to leave its station to assist to emergency boat. But no, in general tugs don't always operate with a buddy.