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43 votes
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How efficient is travel by canoe?

The canoe has three huge advantages: it works in the absence of paths or trails it can carry enormous loads adding paddlers to it makes it go faster The first is probably the most important. I've ...
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42 votes
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How much sea water can I safely drink?

How much sea water can I safely drink? = None If you drink sea water, how much fresh water do you need to drink to off set the sea water you drank? = 2.8 units of distilled water per 1 unit of sea ...
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25 votes

How is hygiene possible with ocean water only?

Early this year I crewed on a yacht that was crossing the Atlantic and all of the crew were doing this for the first time. For our leg from Lanzarote to St Lucia we had 1,000 liters of fresh water in ...
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  • 281
25 votes
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Can I get fresh water from ocean fish flesh?

Let's say you lose 2 liters of water per day. To replace 2 liters of water by eating fish, you need to eat, for example, 2,500 g of cooked Pacific cod, which, besides water, also contains 500 g of ...
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  • 1,309
24 votes
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Is it possible to 'live off the sea'

Theoretically, it might be possible to survive on fish, rainwater and desalinated seawater. In one 1930 experiment, two men survived for a year eating exclusively meat without experiencing any health ...
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  • 1,309
24 votes

How would a sea turtle end up on its back?

There are a few possibilities: Other Turtles This site about pet turtles mentions the possibility that turtles fighting over a mate (or actually mating) may end up on their backs. When breeding ...
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  • 1,109
23 votes

What are those white spots on the sea

They are wave crests. It's wind folding over the top of waves, which mixes them with air. They're also called white caps. If they're closer to the shore you have a change of water color to a lighter ...
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  • 1,980
21 votes
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What's a realistic distance to expect boys aged 11-17 to sea kayak in a single day?

If you don't know what your boys are capable of then it's unfair to have expectations. I'm a Venturer Scout adviser for Scouts Canada; I take boys in that age group on trips regularly. I don't know ...
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  • 53k
20 votes
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What's the difference between a fjord and a fjard?

I think Wikipedia article on Fjard has a very good explanation: Although fjards and fjords are similar in that they are a glacially-formed topography, they still differ in some key ways. Fjords are ...
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19 votes
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What safety equipment should I carry for sea-touring by kayak?

Here's what I normally take with me on these trips at the moment. I can divide them into what's needed before, during and after an incident. Avoiding trouble clothing and food (including drink): as ...
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  • 4,348
18 votes

How to get out through surf in fins?

Walk backwards. The fins will have the least trouble with the water if you walk backwards.
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16 votes

Swimming while in the high seas

Yes. My wife is a geologist and has been on a couple of research cruises in the south Pacific and Indian oceans. It used to be quite common to have a "swim call" when the seas were calm. The vessel ...
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16 votes

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

They are Sea Urchins and they taste like mussels. People mostly eat them raw. They're actually pretty tasty. Oh yeah, you'll peel off the shell and go for the slimy flesh, a delicacy with fresh ...
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  • 3,161
16 votes

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

The best answer I’ve come up with so far is to combine neoprene paddling gloves such as those sold by NRS with an additional pair of waterproof or semi-waterproof mitten shells designed to be worn ...
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  • 3,466
14 votes
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Is saltwater antiseptic?

Seawater is not itself sterile, in fact, it has all kinds of organisms. Salt in a wound is likely to hurt, and saltwater won't be a particularly effective antiseptic. With wound cleaning, it's ...
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  • 8,600
14 votes

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

I haven't been paddling much for several years, but I used to go all winter with simple fleece gloves inside waterproof dishwashing rubber gloves. I tried a half dozen other alternatives, including ...
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  • 141
14 votes

Is it possible to 'live off the sea'

... can someone gather/hunt/farm all of the nutrients required to be healthy whilst never having to land again? Nutrients yes, healthy not likely. A 1000 days is a grueling journey. Reid Stowe, whom ...
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  • 356
14 votes
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Did any lighthouses provide directional navigation signals?

Well, firstly, there's generally no need, given that any reasonable navigator carries a compass, thereby allowing the direction to be determined. With two or more known lights in sight, a simple ...
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  • 4,348
12 votes
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What Navigation Aids can I make on an island with only a knife?

First things first you aren't going to be able to get longitude without an accurate clock and/or a tome of sight reduction tables. Without those aids which you'd be hard pressed to create while ...
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  • 9,608
12 votes
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Are the birds that snatch bread out of the air "more citified" (tamer) than those who let it drop?

No, gulls (of some species at least) steal food from other birds by moving them until they drop it. They must then be adept at snatching the falling food in mid air. There's material of interest in ...
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  • 22.5k
11 votes
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Did I save, or prolong the death throes, of the tuna crabs?

What you're seeing is a huge washing up of tuna crabs, Pleuroncodes planipes, which has created "red beach" all up and down the California shoreline, as well as other states. It's not an uncommon ...
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11 votes
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Technique for swimming with fins?

I am a 25+ year scuba divemaster. Alas, poor fin kicking technique is very common, even among experienced scuba divers. First of all, selection of a fin which is too flexible is better than one ...
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  • 1,319
10 votes

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

Summary: Develop muscle memory for the basic move through instruction and repetition, develop robustness against external water conditions, and address the internal panic response. Develop muscle ...
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  • 3,466
10 votes

How would a sea turtle end up on its back?

In addition to the reasons given in @John Hughes answer, Predators may be another cause. This SeaWorld Parks & Entertainment page on the longevity and causes of death of sea turtles lists tiger ...
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10 votes

How efficient is travel by canoe?

The most efficient boat design is fairly straightforward. Rowing is more efficient than paddling, because anchoring the oar to the hull allows oars to be longer than paddles and longer levers are more ...
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9 votes

Is saltwater antiseptic?

No, seawater cannot be considered antiseptic. At minimum, Staphylococcus, which is the cause of many serious infections and deaths every year, and one agent of necrotizing fasciitis, is "able to ...
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  • 9,445
9 votes

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

I think a reasonable guess would be jellyfish larvae, also known as "sea lice." Sea lice are actually the microscopic larvae of jellyfish and other ocean stingers which contain the same ...
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9 votes
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Do jellyfish actively avoid swimmers in Mediterranean?

Jellyfish, while mobile, are not capable of much evasion. They can steer their bodies, but they are limited in their ability to get out of the way of a faster organism - which is why the majority rely ...
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