I downloaded an app today for use in upgrading my beer
brewing system and realized it has use in sailing too (well, motoring anyway). Its an app that will calculate tank volumes (both rectangular and cylindircal, but not irregular rectangles). It also will calculate remaining volume in the tank based on level of liquid. I've got rectangular tanks
with a tank tender
system so useful for me. Maybe useful to others too. And for designing a new tank.
Its called Tank Calc by Regal Tanks
. Available on Google