With Lee Picton taking the role as chief executive of South Shield, Briggs takes the armband from Jon Shaw who continues to be within the playing squad, but has also taken the role of joint assistant manager.
Briggs is the longest-serving player in the Mariners’ squad, having made 279 appearances across two spells at the club.
He said: “I’m delighted to have been offered the chance to become captain of the club.
“It’s a great honour for me and there have been some incredible captains in the past, including Leepaul Scroggins, Barrie Smith, Julio Arca and Shawsy.
“I appreciate the faith shown in me by Graham, Jon and Bri, and my aim doesn’t change because I’m now captain.
“Everything is still the same in the sense of trying to be successful at the club and getting the club as far up the football pyramid as possible."
Blair Adams has been named vice-captain.
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