IMHO....your best options....pump out when you go to the big lake...
On the smaller lake...well, I guess it depends on how often you need to pump out. Does it happen frequently? Or can you make it to the big lake?
If it's pretty rare that you fill the waste tank while on the small lake....a simple change in behavior will get you to the big lake. (pee overboard, poo before ya go out, etc)
If you're filling the tank all the time, and not getting out to the big lake often enough...then the marine head system is not the best waste disposal system for you, your needs and usage. Personally, I would remove the marine head system and install a porta-potti.
Its a better option than what some folks in your situation do....install a macerator and illegally dump in the lake. Although, compared to how much animal waste goes into the water from all the fishes, racoons, squirrels, birds, beavers, etc...and all the waste from rainwater runoff flushing systems clean....dumping a little 6 gallon tank of human poo macerated...would not even be detectable. It's one of those things where one or two folks doing it is no big deal...but when hundreds of boats are doing it...
On the smaller lake...well, I guess it depends on how often you need to pump out. Does it happen frequently? Or can you make it to the big lake?
If it's pretty rare that you fill the waste tank while on the small lake....a simple change in behavior will get you to the big lake. (pee overboard, poo before ya go out, etc)
If you're filling the tank all the time, and not getting out to the big lake often enough...then the marine head system is not the best waste disposal system for you, your needs and usage. Personally, I would remove the marine head system and install a porta-potti.
Its a better option than what some folks in your situation do....install a macerator and illegally dump in the lake. Although, compared to how much animal waste goes into the water from all the fishes, racoons, squirrels, birds, beavers, etc...and all the waste from rainwater runoff flushing systems clean....dumping a little 6 gallon tank of human poo macerated...would not even be detectable. It's one of those things where one or two folks doing it is no big deal...but when hundreds of boats are doing it...

