Hi,
I am looking at fitting a holding tank and need help with options for set up.

How big does the tank need to be? Two crew on the boat, storage for 48 hours would be enough. I can find space for around 60 litres.

I will include a macerator in the system. The macerator can be part of a new electric toilet that delivers to the tank. The tank will then be gravity drained. The alternative is to locate the macerator after the tank with a pumped discharge. A electric toilet would be nice, but are there likely to be blockage problems with a gravity discharge of the tank. The gravity route will be short and straight, no kinks etc.

The toilet is forward in the boat (near the mast), so venting the tank to the stern is not an option. Does anyone have experience with venting the tank to the anchor locker? Is this arrangement likely to result in smell drifting into the cabin, cockpit etc?

Thanks for any help.