The hull-deck joint is also bonded with fiberglass. This stout approach to structural design produces the required strength and stiffness without relying on interior cabinetwork and partitions for support. The 680's machinery space is accessed through a hatch in the cockpit. A pair of Caterpillar 3412TAs was custom outfitted to include a stylish trim package and the Sea Ray logo. Sea strainers with transparent covers are mounted neatly on the front of the engines, and an oil change system services both engines and the 25 kW generator.
Access is good, and the bilges are neat and finished.
Sea Ray invested heavily in the 680's systems design in an effort to keep boaters boating. A common drain system funnels gray water to a pair of sumps in the machinery space, minimizing through-hull fittings. A central freshwater manifold is easily accessible, and the 120 VAC freshwater pump is fitted with a 12 VDC backup pump that kicks in automatically if AC power is lost. The waste system is designed with redundancy, as well. It is clear the 680 is well designed to compete in an international market, a goal Sea Ray achieved while emphasizing dependability and ease of operation.