Montenegro Shipping Lines leave Dalahican Port at 12 Noon and 12 midnight every day. It takes around three hours to get to the port in Mogpog, Marinduque. The passenger area in the ship is not air conditioned and there are no special seatings for anyone.
vehicle in line (note the ropes)
arranging the cars can be quite tricky
the port in Mogpog
Feel free to bring your packed lunch if you'd require something substantial because the store in the ship mainly sells bottled water, softdrinks, Gatorade, biscuits and chips. However, someone asks for food orders as passengers are settling down for the 3-hour journey and the "jolly chicken" is a crowd favorite (it's rice and fried chicken). Plus, there are carinderias just outside the port in Mogpog that offer good, cheap fare.
Of course, those willing to pay a higher price can take the 45-minute fastcraft ride instead.