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The height of a wave is the distance measured vertically from the _____ to the _____
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The length of a wave is the distance between _____.
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AUXSEA Ch 6
| Question | Answer |
|---|---|
| The height of a wave is the distance measured vertically from the _____ to the _____ | Trough, crest |
| The length of a wave is the distance between _____. | Two consecutive crests |
| The time it takes two wave crests to pass the same point is known as the _____ . | Period |
| What is fetch? | The uninterrupted expanse of water over which the wind blows. |
| The angular measurement from the trough to the crest of a wave is the_____ | Slope |
| Name two types of non-wind waves. | Seismic wave, Tidal waves |
| What is swell? | Waves generated by wind that continue after the wind has died |
| Waves turn into surf as they _____. | Near the shore |
| The two types of breaking waves and surf are _____ and _____ | Plungers, rollers (Study Guide: ‘spillers’) |
| _____ and _____ are the two types of waves that are caused by the passing of a motorboat. The _____ wave is the most dangerous. | Bow wave, Stern wave, Stern |
| List three ways that a dangerous cross sea can develop. | Tidal currents, two angling wave systems, sudden wind shifts |
| A boat with a _____ will be greatly affected by strong winds. | High freeboard, High superstructure |
| A boat with a _____ will be greatly affected by a strong current | Deep draft |
| List some of the elements that the effect of wind and current upon a boat depends. | The strength of the wind, The length of the boat, The superstructure of the boat, The freeboard of the boat, The draft of the boat, The direction of the wind in relation to the heading of the boat, |
| List some of the elements that the effect of wind and current upon a boat depends.(cont'd) | The direction of the current in relation to the heading of the boat, The direction and strength of the current in relation to the direction and strength of the wind. |
| When running before the seas, if possible, the boat should be maintained on the _____ ______ of the wave. | Back side |
| What is the purpose of a sea anchor? | Slow the drift and help control the boat in relation to wave direction. |
| List the steps to prepare for rough weather. | Secure all hatches; close all ports and windows, Pump the bilges dry and repeat this action as often as required. (Free water in bilges adversely affects the craft's stability.), |
| List the steps to prepare for rough weather.(cont'd) | Secure all loose gear; put away small items and lash down the large ones, Break out life preservers and have all on board wear them if the situation worsens; don't wait too long. |
| List the steps to prepare for rough weather.(cont'd) | Break out emergency gear that might be needed, such as hand pumps or bailers, sea anchor, etc, Get a good check of your position if possible and update your chart. |
| List the steps to prepare for rough weather.(cont'd) | Prepare plans for altering course to a protected harbor or sheltered waters if necessary, Reassure your crew and guests; instruct them in what to do and not to do; give them something to do if possible to take their minds off the situation. |
| What is the pitfall in using a tripping line with a sea anchor? | Can become tangled with the towing line and collapse sea anchor |
| List some of the items you can use to make an emergency sea anchor in the absence of a ready-made one. | A bucket, A basket, A wide board, A swamped dinghy |
| What is the purpose of towing a warp? | Acts as a brake, keeps boat running straight quiets sea astern |
| If conditions get really bad, slow down and hold your bow at an angle of about _____ degrees to the sea. | 45 |
| In a head sea, a vessel with too much weight forward will _____ rather than rise. | Plunge |
| In a head sea, a vessel with too much weight aft will tend to _____ . | Fall off |
| Thrown broadside to the swells, or in the trough can cause a vessel to _____ | Broach |
| When a vessel runs down a steep wave, buries her bow, and the next crest throws her stern over, she has _____ . | Pitchpoled |
| What happens to a vessel that is pooped? | The following sea breaks into the cockpit |
| The primary needs of safety in fog or other conditions of reduced visibility are to see and be seen, and to _____ and be _____ . | Hear, heard |
| One way to be seen in reduced visibility by vessels that have radar sets is to hoist a _____ . | Radar reflector |
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