| Category | SK I | SK II | SK III | SK IV | SK V | SK VI |
| Geography. (Fetch is the unobstructed distance over which wind can build waves.) | In areas protected from waves in case of wind. | Fetch less than 10 nautical miles (nm). Crossings less than 0.5 nm except in very protected areas. | Crossings up to 2 nm; fetch longer than 10 nm. | Crossings up to 5 nautical miles. | Crossings more than 5 nm, but less than 3 hours at the speed listed for the trip. | Trips combining long fetch with difficult or impossible landing for most of a day. |
| Hydraulics | Insignificant currents. | Maximum predicted current up to one knot (kt). | Maximum predicted current up to two kt. | Currents may be greater than 2 kt, but less than the slowest paddler’s top speed. | Currents may be faster than the group can paddle against. | Exposure to hazards at other levels taken to extremes. |
| Route | Day trips near shore. | Either the route is protected or has easy escape routes. | May involve crossing eddy lines and tide rips. | May cross STRONG eddy lines, tide rips, and upwellings. | May include launching and landing in surf. | Exposure to hazards at other levels taken to extremes. |
| Acceptable Conditions. | Calm | Generally try to avoid choppy water and wind above 10 knots. | Generally will not go in whitecaps but be prepared for paddling in waves large enough to wash over the deck, and be comfortable in winds of at least 10 knots. | May include steep waves and swells. Be comfortable paddling in 15 knot winds. | For groups prepared to set out in rough weather, whitecaps and fast currents. | May only be negotiable with favorable conditions. Kayak rescues may not be possible. |
| Required Skills and Experience. (Note that the required skills are cumulative across this row). | Previous trip experience for trips longer than 5 nautical miles. | Must have practiced sea kayak rescue techniques. | Conditions may require bracing skills. Previous assisted and self-rescue practice. | Conditions may require anticipatory leaning, reflexive bracing, using the paddle to stern rudder, and the ability to read moving water. Familiarity with charts and navigation is required. | Trip members must have tested their skill in rough conditions, know their limits, and be self-reliant in the even of separation from the group. Eskimo roll highly recommended or required. | Extensive experience including kayak surfing and rolling are required. |