Article 225 of the 2014 NEC provides requirements for running branch circuits outdoors, on or between structures (including buildings and poles). Pay special attention to Table 225.3. It lists specific cases of equipment and conductors, showing which other Articles apply. If you’re installing outdoor receptacles at a marina, you need to also apply Art. 555.
Outside Branch Circuits and Feeders, Part 1
What if you find conflicting requirements between Art. 225 and the one from Table 225.3 that applies to your particular special case?