The Isle of Man FA cap joins the Merseyside outfit on a permanent deal after scoring four goals in 10 appearances during a loan spell toward the end of last season.
That deal from National League North side Curzon Ashton was brought to a premature end when the 32-year-old broke his ankle as the club tried unsuccessfully to stave off relegation from the Northern Premier League.
Speaking about the move, Cummins said: ’It was an easy decision to return to Marine for the 2019-20 season.
’The management and board have made their intentions clear and promotion is the number one target for both them and myself.
’I was unlucky to get injured when I did as I felt we were in good form, but that is in the past now and I personally don’t want to dwell on last season, but go in to this 125th anniversary season full of optimism and with one objective.
’I will also be looking forward to seeing who else arrives over the next few weeks and getting down to business come mid-August.’
The move brings to an end a five-season spell at Curzon where he scored 73 goals in 210 appearances.