They are constructed using the worst possible web page coding. Each line of text is individually placed at an absolute position. If you make the text larger, the lines to not wrap or space apart appropriately.
Also note that the rules are presented in a completely confusing sequence. The printed rules in the box are the same. Here's a summary of what happens that you can refer to when reading the rules:
+ Bid for Harbor Master HM buys a share HM selects goods to ship HM places punts on board + Place Accomplices (twice around if 3 players) + ROLL and move punts + Place Accomplices + ROLL and move punts + Resolve Pirates (board) + Place Accomplices + Resolve Pilots + ROLL and move punts + Resolve Pirates (plunder) + End of round payouts