Because they are no longer looking for speed, but freedom from the risks of the sailing boat: no more being struck by the boom, climbing the mast, or contortions to secure the staysail. ... Whatever its hull type, the Trawler remains a seagoing boat that can travel in a safe and regular way even under difficult conditions.

Can a ship move without sails?

The need for tacking

Sailing ships cannot proceed directly into the wind, but often need to go in that direction. Movement is achieved by tacking.

Why do some trawlers have sails?

Recently there was considerable discussion of the steadying sail for small trawler yachts on the Trawlers and Trawlering list. Some folks did testing with the sail up and down, and all who have steadying sails say they help damp out rolling at all times, even if there is little wind.