Sheltered Tidal Water/Sea
Small enclosed bays, enclosed harbours, where there is minimal possibility of being blown offshore; defined beaches (a short section of beach with easy landing throughout, no tide races or overfalls beyond the beach), in conditions in which swimmers and beach craft could be happily operating winds not above Beaufort force 3 (Beaufort force 2 if offshore when greatest of caution must be exercised); the upper reaches of some suitable, slow moving estuaries during neap tides. In all cases the wind and weather conditions must be favourable.
Moderate Tidal Water/Sea
A stretch of coastline with available landings every one to two miles or one hour paddling, including areas where it is not easy to land. Crossings not exceeding two nautical miles. Up to 2 knots of tide (but not involving tide races or overfalls). Winds not exceeding Beaufort force 4 . Launching and landing through surf (up to 1 metre, trough to crest height).
Advanced Tidal Water/Sea
Any journey on the sea where tidal races, overfalls or open crossings may be encountered, which cannot be avoided; sections of coastline where landings may not be possible or difficult; difficult sea states and/or stronger winds (Beaufort force 4 or above); launching and landing through surf (up to 1.5 metres trough to crest height).