The two-partner team is set to join Hill Dickinson as part of the firm's shipping team.
Ken Thwaites, one of the two partners in the department, says: "Hill Dickinson has more of a shipping background, and is also keen to expand it further in London."
The yachting department joined Berrymans two years ago from a small specialist shipping firm Ingledew Brown Bennison & Garrett.
Thwaites, a shipping partner for 23 years, tells The Lawyer that he is "unable to comment further as to why things did not work out".
Paul Taylor, senior partner at Berrymans, says: "We are sorry that it has not worked on either side" and adds that "Berrymans is changing the direction of the shipping department, taking on a former master mariner to add to our marine practice".