The Grand Mariner 270 offers additional playpen square footage and unique new floor-plan choices for the larger boat. With this larger pontoon boat, you have a Mercury 400HP engine and three 25-inch diameter tubes with lifting strakes and aluminum under skin for improved stability and performance. Consider adding the Glass Dash Helm upgrade which includes a 12-inch and 7-inch touch screen providing control of the Polk stereo and lighting, as well as interactive GPS charts, engine data and…