Yes, you can use it. Get a new model as they are more efficient. A 1.7cf compressor driven would do nicely. Had one for years and the sea motion never hurt the compressor. It is best to place the door facing forward or aft as when placed facing either side the door tends to swing open spilling the contents. A hasp can be placed on the door to solve the problem. When underway I would power it with a 1200 watt inverter. A small fridge consumes around 1.1 amp at 120V or 11 amps at 12V . As it only runs an average of 15 minutes per hour depending on the ambient temperature it only consumes around 2.75 amps and with a 20% inverter inefficiency round it up to 3.4 amp/hour. with a 100 amp battery you can get 10-12 hours of use before needing to recharge. There are a few things you can do to help, 1) a full refrigerator works more efficiently 2) precool the refrigerator on shorepower before heading out 3) keep beer and drinks in an ice cooler so you do not have to open the refrigerator door too often. The inverter would need to be fused and hardwired.