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Questions tagged [sea]

Questions specific to the sea or oceans

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34 votes
2 answers
13k views

Is it possible to 'live off the sea'?

I've recently become aware of the American 'survivalist' or 'prepper' phenomenon. The general idea seems to be that 'something bad' (exactly what seems to vary) is going to happen, civilization will ...
2 votes
0 answers
152 views

How many boats have been found encased in ice but still accessible?

I was watching National Treasure again today and the scene in which Cage and his team discover and explore the Charlotte made me curious. They find the ship buried under ice and snow, yet, though ...
23 votes
4 answers
7k views

How efficient is travel by canoe?

How efficient is travel in a canoe, in terms of effort/time required to cover distance? Or kayak, pirogue, any kind of small boat that is moved by paddling instead of sail or motor - is there a ...
3 votes
0 answers
120 views

Pacific Northwest - how can I find about sea Bioluminescence events?

I happened to stumble upon the last bits of a bioluminescence event on Cortes Island, in BC, in 2011. It was absolutely amazing, but most of it had happened in the previous days. I'd love to go ...
12 votes
1 answer
13k views

What are those white spots on the sea

Yesterday I was flying above the Mediterranean sea, it was a nice day, without storms or strong winds. I fly around 20 minutes above it before arriving to the ground. During these 20 minutes I saw ...
7 votes
1 answer
859 views

Locations of origin for castaway on Papua New Guinea

I'm sketching a scene in a story involving a castaway washing up on the shore of Papua New Guinea. It would work best if he made an involuntary ocean voyage from a long way away, perhaps having been ...
6 votes
1 answer
494 views

What kind of sea creature leaves this skin/shell?

While hiking the beach at Cape Scott in British Columbia last summer, I kept on seeing these weird pieces of organic flotsam. I'm familiar with kelp, dead jellyfish, sea urchin shells, etc... but ...
27 votes
3 answers
45k views

How is hygiene possible with ocean water only?

Is it possible to clean yourself and clothes with ocean water only, without polluting the water and almost without budget ? If so, how ? I've read that it's possible to: brush your teeth with sand, ...
4 votes
1 answer
239 views

Why did ships use to have a prefix identifying their engine kind?

Ships used to have something like "S/S" (for "Steam Ship") or "M/S" (for "Motor Ship") in front of their name. Why exactly did they do this? Why did it matter ...
1 vote
1 answer
186 views

Finding fish offshore

I'm trying to understand the process of fishing with a net. Two people with a small boat and a net, fishing in the sea within sight of shore. (My actual interest in this is that I am writing about ...
19 votes
3 answers
2k views

How should I check that the anchor is secure when I anchor a small yacht off unfamiliar land?

When sailing I may anchor in a different bay each evening and take a dinghy in to land to sleep in a tent overnight. I always worry that when I wake up in the morning the boat may no longer be there....
1 vote
1 answer
226 views

What baby fish is this? (UK)

What fish is this? I found them in England, near Portsmouth, south of Hayling island on the breathtakingly stunning sand flats out to sea :)
16 votes
2 answers
574 views

What safety equipment should I carry for sea-touring by kayak?

What equipment should I carry in case of emergency on a coastal kayaking trip? I normally do short trips (1 week or less) around the islands of northwest Scotland. I tend to travel solo (sometimes no ...
-1 votes
1 answer
164 views

Sea water as mineral supplement

If you are stranded in Alaska and you have plenty of fresh water in the form of snow Can you get the potassium you need by adding a small amount of sea water to your melted snow? At what ratio? And ...
0 votes
2 answers
668 views

How can divers be sure that there are no sharks or other lethal water animals where they dive?

I've always been scared of sharks. It seems like the most natural thing in the world to be afraid of. I instinctively haven't forgotten what it was like for my ancestors to swim around in that big, ...
21 votes
8 answers
8k views

What are the dangers of swimming in natural waters?

What are the dangers of swimming in natural bodies of water? In essence I would like to know about all types of waters, but I am mostly interested in sea because it is most relevant to me. Like many ...
9 votes
3 answers
825 views

What will the water temperature be at Sharm el-Sheikh at a depth of 30m in October?

You can easily find the temperatures at the surface of the sea. However, to choose the correct diving suit, I would like to know the temperatures that can be expected at a depth of about 30 meters (...
19 votes
2 answers
4k views

How to estimate distances while at sea?

While kayaking or swimming out in the open waters, it is quite important to be able to judge distances accurately before attempting to get from one point to another, such as from island to island. ...
19 votes
2 answers
2k views

Swimming while in the high seas

When sailing, can the passengers of the yacht safely go swimming while in the open seas? That is, when some miles away from the coast-line.
16 votes
4 answers
4k views

How to estimate current speed and direction while swimming at sea?

In an episode in the tv series "I shouldn't be alive", crew members of a yacht racing team got caught in a violent storm and found themselves stranded in the Gulf of Mexico after their boat capsized. ...
8 votes
5 answers
1k views

Did any lighthouses provide directional navigation signals?

Rather than shining in all directions, lighthouses usually produce a directed beam of light that continuously sweeps in a circle. This allows: the light to be more concentrated and so appear brighter....
5 votes
1 answer
500 views

What is this plastic net with a wide middle and bottom that looks like an upside-down flower hanging from a tree?

We recently (July, 2019) went to Bar Harbor, Maine, United States, to visit friends who live on the ocean. My husband took a walk on an established path (he's very serious about Leave No Trace) at the ...
14 votes
4 answers
2k views

How to get out through surf in fins?

I got myself some short fins since as a fairly weak swimmer especially in my legs I wanted a bit more confidence and power when swimming in the sea. However one basic problem I've encountered - how ...
16 votes
4 answers
7k views

Technique for swimming with fins?

I recently bought some fins... Short, much stiffer than some fins used by divers these are more aimed at surfing. I can feel they make me faster but am struggling with technique. I feel I'm fighting ...
4 votes
1 answer
520 views

If you are stranded at sea with a basic set of fishing equipment, how reliable of a food supply are fish?

We have a question about desalinating water while stranded at sea, and another that asks if you can get desalinated water from eating fish. However, even if you could get desalinated water from fish ...
16 votes
3 answers
3k views

What’s the best thing to wear on your hands when sea kayaking in very cold weather?

What product or combination of products best protects your hands while kayaking in winter? I’m interested in a system which provides comfort for extended paddling but also the peripheral activities ...
7 votes
3 answers
1k views

How do I make and test a radar-reflecting hat?

At significant risk of tin foil hat jokes, I’ve read compelling evidence that a homemade hat incorporating angled and crumpled aluminum foil may slightly increase a kayaker’s visibility on radar — not ...
7 votes
2 answers
446 views

What can I do to be more visible to other ships’ radar when traveling in a sea kayak?

I’ve seen small radar reflectors for sale. Should I carry one when kayaking? What else can I do such that boats can use their radar to be aware of my location when they can’t see me due to poor ...
18 votes
1 answer
830 views

Identification of a jellyfish-like, shapeless sea-creature from India

Photographed off the Western coast of India, Goa, to be precise. Not even sure this is a creature since I've never seen anything like it. It appeared to move by shooting tiny jets of water from its ...
10 votes
2 answers
7k views

How would a sea turtle end up on its back?

There is a video going round of two guys flipping a sea turtle that had ended up on its back so it could get back into the water. How would a sea turtle end up on its back in the first place (it sure ...
12 votes
2 answers
2k views

What are these round, spiny, puffy, green things from the ocean in Northeast United States?

Last October, we were on a road above a beach in a small town near Bar Harbor, Maine, in the Northeast United States. We looked down and saw two fishermen loading their trucks with piles of something ...
5 votes
2 answers
5k views

What's the difference between the Norwegian fjord and the Scottish sea loch?

I want to know the major differences between these two systems.
4 votes
1 answer
370 views

How can I tell if there's a camouflaged octopus in a coral reef, so I can keep from disturbing it?

This question is based on my desire to avoid disturbing, injuring, or scaring away an octopus which is camouflaged to look like a coral reef. Since it's so difficult to see, I'd like to know how to ...
11 votes
2 answers
168 views

Indicators of good Atlantic Ocean surf conditions

When researching surf conditions, what weather cycles indicate good overall conditions for a North American Atlantic Ocean-based break?
6 votes
1 answer
1k views

What is the history of the Duckbill rock formation in Oregon?

During an internet search for fun places to go in the Western United States, I came across a number of articles about an unusual rock formation in Oregon called Duckbill. It was called iconic, ...
9 votes
1 answer
231 views

What is the Chincoteague Pony Swim on Assateague Island in Virginia and Maryland?

Ever since I read a book called Misty of Chincoteague as a child, I've wanted to see the Wild Chincoteague Ponies, on the Eastern shore of the United States. I believe there are two herds on ...
10 votes
2 answers
242 views

How to make my kayak Eskimo roll reliable in rough water?

How do I develop my kayak “Eskimo roll” from something I can do most of the time in a calm lake or pool to something I can trust to work close to 100% of the time in real sea or river conditions?
8 votes
3 answers
2k views

Kayak for fishing and low class rapids?

I am in the market for a kayak and am wondering what type of kayak or what features I should look at given my requirements. Here's the details you'll probably need to help me out: I'm 6'1" and 215 ...
4 votes
2 answers
908 views

What are the differences between a lighthouse and a light station in terms of the specific purpose?

One summer evening we drove to Race Point, the farthest tip of Cape Cod, Massachusetts, USA. We were told there was a lighthouse at that spot, and wanted to see the light shine through the darkness, ...
1 vote
2 answers
1k views

What type of boat is this with a single mast and a square sail? [closed]

What type of boat might this be? Or what category of boats would it fall under?
41 votes
1 answer
51k views

How much sea water can I safely drink?

Anyone who has played in the ocean knows getting a little sea water in your mouth and swallowing it will not kill you. Seawater contains salt. When humans drink seawater, their cells are thus taking ...
2 votes
0 answers
257 views

How much food is needed for three months of food when rowing across an ocean?

Related to this question, if one were to go on a three-month rowing trip across an ocean, is there an estimate of how much the food would be needed? It's certainly possible to give an estimate when ...
3 votes
1 answer
265 views

How predictable are the doldrums?

There have been a few Atlantic and Pacific row boat crossings. Poor weather is a significant risk. While it might be nice to row with the wind at your aft (back of boat), it might also be nice to ...
8 votes
2 answers
273 views

What is head/lift indication in a digital compass on a sailboat?

A simple explanation would be great. I am reading a manual for digital compass and there is a paragraph with the following words: The SpeedPuck automatically detects when a sailor is trimmed to a ...
0 votes
1 answer
5k views

What are the shortest and longest crossing points of the Atlantic?

Inspired by a recent question. If I want to cross the Atlantic Ocean in a boat, what are the shortest and longest possible crossing sites? Where crossing = going from one continent to another where ...
6 votes
2 answers
299 views

Activities on a long voyage to avoid boredom?

What should the crew and passengers do on a long voyage? If they do nothing, their attention is scattered and may become remiss. You can begin to wash the boat, but I do not think that is the best ...
15 votes
1 answer
4k views

Can I get fresh water from ocean fish flesh?

Ocean water has about 35 Grams of salt per liter. For the human body salt content in body fluids is about 9 Grams per liter. See related question How much sea water can I safely drink? While it is ...
6 votes
1 answer
371 views

How to recognize an ocean desert from the surface?

There are large areas of the ocean that are essentially lifeless, often called ocean deserts. If I am traveling the ocean, and not familiar with potential sea life in the area, can I tell from clues ...
5 votes
1 answer
232 views

When fishing in the Ocean off the US coast, at what point do fishing laws stop?

If you are fishing in the ocean off the United States Coast. At what distance from shore do US fishing laws no longer apply? The US Coast Guard listes, boundaries at 12, 24 and 200 Miles. ...
7 votes
1 answer
1k views

How can you identify whether brackish water is too salty to drink?

Sometimes there are sources of water which are slightly contaminated with salt, such as coastal wells or pools of rainwater in rocks near the coast, or water containers with pinhole leaks which have ...