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Questions tagged [sea]

Questions specific to the sea or oceans

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35
votes
1answer
38k 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 ...
15
votes
1answer
3k 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 ...
14
votes
2answers
374 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 ...
14
votes
1answer
28k views

What's that stinging feeling when I swim in the sea?

When I swim in the sea around Singapore, I get stinging/prickling/electric sensations on my skin in certain areas of the water sometimes. There aren't any visible creatures nearby. What are these? ...
4
votes
1answer
322 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 ...
2
votes
0answers
207 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 ...
12
votes
3answers
283 views

What Navigation Aids can I make on an island with only a knife?

In a recent discussion about navigating from a deserted island, it was suggested that if I have a knife and natural resources I could create my own navigation aids. In this instance I was planning to ...
21
votes
2answers
24k 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
2answers
780 views

Portable desalination hand pump filter life?

I was looking into portable desalination hand pumps. and I found this one one Amazon for $959 it says the Katadyn Survivor 06 is the world's smallest hand-operated desalinator and can easily fit ...
8
votes
1answer
3k views

Can I guess the size of a shark by the size of its dorsal fin?

Is there a relative scale to which one can estimate the size of a shark by looking at its dorsal fin? I know it will differ from species to species, but is there a general guideline maybe for each? ...
7
votes
2answers
213 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 ...
5
votes
1answer
186 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. ...
3
votes
1answer
61 views

Telescopic surf fishing rods - Are less segments better?

I am looking for a telescopic surf fishing rod of about 14 feet length & lure weight up to 250grams/8oz. Is it better if a telescopic surf rod has less segments or does it not matter ? This one ...