Actually, this is what I think. #BrightWin probably have worked nearby or around the area (the cables and camera).
But after finish, they went on that cruise privately, or only the two of them + driver (based on Bright's first IGS and the construction of boat).

If they are working or shooting something, it's not possible for them to be in such casual pose while playing with their phone.

Also, it might be a gift from the sponsor (True, or whatever work-related brand they just did)

The stylist that also went on a cruise most probably used another boat, becos fom Bright's first IGS there's rly no one else other than BrightWin