[AdamLein]

Around here there are two yacht clubs that use the same set of marks. Two of them are permanent government marks, the other four are dropped by the race committee in more or less standard locations; the sailing instructions contain lat/lon coordinates of these locations, and they are depicted on a little photocopied chart. Also, you get used to the locations pretty quickly. However I would agree that it's still difficult to see the next mark right away, but with a couple of crew members looking out for it we usually spot it quickly.