Sea
Seastate Chart
Determining the sea and weather conditions offshore as developed by the US Navy.
Surface Craft
Delivering SEALs to their objective is the mission of these craft and the crewmen who operate them. Each craft detailed here has a unique capability. Long-range transit, Open water and Littoral special operations and riverine insertion are just a few. These boats get the SEALs where they need to go provide support while on a mission and get them back to safety again. They are an integral part of the Naval Special Warfare package.
Determining the sea and weather conditions offshore as developed by the US Navy.
| SEA STATE CHART FROM U.S. NAVY DIVING MANUAL |
||||||
|---|---|---|---|---|---|---|
| Sea State | Description | Wind Force | Wind Description | Wind Range (knots) | Wind Velocity (knots) | Wave Height (feet) |
0 |
Sea like a mirror. | 0 | Calm | <1 | 0 | 0 |
1 |
Small wavelets, still short but more pronounced; crests have a glassy appearance but do not break. | 2 | Light Air | 1-3 | 2 | 0.05 |
2 |
Large wavelets, crests begin to break. Foam of glassy appearance, perhaps scattered whitecaps. | 3 | Gental Breeze | 7-10 | 8.5-10 | 0.6 0.88 |
3 |
Small waves, becoming longer; fairly frequent whitecaps. | 4 | Moderate Breeze | 11-16 | 12 13.5 14 16 |
1.4 1.8 2.0 2.9 |
4 |
Moderate waves, taking a more pronounced long form; many white-caps are formed. Chance of some spray. | 5 | Fresh Breeze | 17-21 | 18 19 20 |
3.8 4.3 5.0 |
5 |
Large waves begin to form; white foam crests are more extensive everywhere. Some spray. | 6 | Strong Breeze | 22-27 | 22 24 24.5 26 |
6.4 7.9 8.2 9.6 |
6 |
Sea heaps up and white foam from breaking waves begins to be blown in streaks along the direction of the wind. Spindrift begins. | 7 | Moderate Gale | 28-33 | 28 30 30.5 32 |
11 14 14 16 |
7 |
Moderately high waves of greater length; edges of crests break into spindrift. The foam is blown in well marked streaks along the direction of the wind. Spray affects visibility. | 8 | Fresh Gale | 34-40 | 34 36 37 38 40 |
19 21 23 25 28 |
8 |
High waves. Dense streaks of foam along the direction of the wind. Sea begins to roll. Visibility affected. | 9 | Strong Gale | 41-47 | 42 44 46 |
31 36 40 |
9 |
Very high waves with long over-hanging crests. Foam is in great patches and is blown in dense white streaks along thedirection of the wind. The surface of the sea takes on a white appearance. The rolling of the sea becomes heavy and shock-like. Visibility is affected. | 10 | Whole Gale | 48-55 | 48 50 51.5 52 54 |
44 49 52 54 59 |
10 |
Exceptional high waves. The sea is completely covered with long white patches of foam along the direction of the wind. Everywhere the edges of the wave crests are blown into froth. Visibility seriously affected. | 11 | Storm | 56-63 | 56 59.5 |
64 73 |
11 |
Air filled with foam and spray. Sea completely white with driving spray. Visibility very seriously affected. | 12 | Hurricane | 64-71 | >64 | >80 |
Surface Craft
Delivering SEALs to their objective is the mission of these craft and the crewmen who operate them. Each craft detailed here has a unique capability. Long-range transit, Open water and Littoral special operations and riverine insertion are just a few. These boats get the SEALs where they need to go provide support while on a mission and get them back to safety again. They are an integral part of the Naval Special Warfare package.
