Marginal, indeed
I agree, the ferry tanks look like a must. I'm not the one in control of the operation but I want to get as much information as I can to put in my two cents if given the chance to go. Looking at the northern route I would need to go 900nm at some points and that does not appeal, especially at this time of year. Thanks for all of the input, and the Great Circle Map link was terrific!
DB