TWO second half goals by Adi Yussuf made it five wins out five under Mickey Moore's reign as assistant manager.
The forward struck twice in quick in the space of a few minutes to give the visitors a deserved lead against a young Spireites team.
Town didn't have it all their own way though and Andy Warrington had to get down well to his left to deny the hosts, and had to be alert to tip over a hot from the edge of the box.
Josh Gowling had a late chance to put the Mariners the lead going into the break, but the defender could only send his shot high and wide after receiving Ben Davies' corner at the far post.
Chesterfield pulled a goal back almost immediately after Yussuf's brace, and they almost found themselves level when Jake Beesley was sent through on goal, but the forward fired wide with just Warrington to beat.
The #GTFC bench this afternoon. #CFC 0-0 #GTFCpic.twitter.com/V77qbiONm6
— Grimsby Town FC (@officialgtfc) March 7, 2017
Sean McAllister made his return from injury as he replaced Vose in the second half, while Ahkeem Rose came on for the last five minutes of the game..
Asante saw his shot from a tight angle easily gathered by Allinson before the referee blew for full-time to confirm the victory for Town.
Reaction from Mickey Moore coming up soon.
The Town Team.