The switch panel is not required for this with Lagoons. To empty the
tanks into the sea while underway, just open the seacocks (parallel to the though
hull fittings) and gravity will empty the
tanks. Depending on the boat, the valves are located under the floorboards behind the door to the stern cabins. In the owner's
cabin, in the cabinet at the bottom left behind the bathroom door.
To be able to
pump out the stuff, a suction hose must be inserted from the outside. In the 4
cabin version the tank caps are near the shrouds ("waste", near "water"), one per tank, in the owner's version starboard tank cap is in front of the
saloon starboard.
Odor also occurs when there is
water in the toilets, if they have seawater flush. Then just flush through and finish with a fresh water flush from a bucket or something.