Abstract: A trocar assembly can include a cannula, a seal cartridge, and an obturator. The seal cartridge is configured to be releasably coupled to the cannula and to be disposed at least partially within the cannula in a coupled configuration of the seal cartridge. The obturator is configured to directly latch to the cannula and to extends through the cannula and the seal cartridge in a coupled configuration of the obturator.

Abstract: A replaceable buoy cover or buoy sock includes a tubular, cylindrical sleeve which is closed at a top end by a cap. A lower end of the sleeve is provided with a cinch member. The buoy cover is removably secured to a buoy by sliding the sleeve over the buoy until the cap contacts the top of the buoy. The cinch member is tightened to frictionally secure the cover on the buoy. When replacement of the buoy cover is required, the cinch member is cut to release the cover, and the cover is removed and replaced with a new cover. The replaceable buoy cover may be provided in standard marker buoy colors and has standard symbols or markings applied thereto.