How would charts be useful, considering everyone will have a map of SPii automatically, and everyone may be given a map with positions of buildings on it? In RL, sea charts are useful, but in SL it's doubtful whether they serve any purpose. There could be a marina team which organises any regattas, registers PYs of boats (or rather a SL equivalent), and calculates winners, but I can't think of any other functions and so perhaps "Marina staff" might be a better name?