Sqlite has two big problems: maximum 2GB per database and it gets slow with large files.
I think the tarred TrekBuddy format is probably best because you can have as many <1GB archives as you like. All it needs is the ability to select the right archive automatically as you move and zoom around.
I think the tarred TrekBuddy format is probably best because you can have as many <1GB archives as you like. All it needs is the ability to select the right archive automatically as you move and zoom around.