Solo rower Tim Crockett, who used to be in the Royal Marine Special Boat Service, is raising money for veterans struggling with PTSD.
Mr Crockett, who's one of the few taking on the challenge on his own, says morale is high despite some rough sea conditions.
"Given the weather we've had, it's not been great, it's been a hard slog," he explained.
"The weather's dropped out on a couple of occasions and we've been moved around so that obviously affects our arrival time and it makes things a lot harder.
"Currently, it's like rowing through treacle again, so pretty tough.
"Other than that, morale is high, next goal is obviously the halfway point...hopefully reach that within the next six to eight days and then hopefully our weather will be on our backs and we can coast on into Antigua a bit quicker than 37 days."