#marine navigation

[smallcraftlife]

Having Navionics integrated with AIS and Sonar Phone makes for easy displaying on my iPad.

[wh40kartwork]

by Anastasiya Landasseln

[necrophiliak]

[alphynix]

Nihohae matakoi was a dolphin that lived in the coastal waters around what is now Aotearoa New Zealand during the late Oligocene, about 25 million years ago. Part of a group known as waipatiids, it was much closer related to modern South Asian river dolphins than to modern oceanic dolphins.

Around 2m long (6'6"), it had unusually long tusk-like teeth at the front of its jaws, splaying out almost horizontally forwards and to the sides.

These teeth lay too flat to effectively interlock as a "fish trap", and their fairly delicate structure and lack of wear marks suggests they also weren't used for piercing large prey, sifting through gritty sediment, defending against predators, or for fighting each other. But Nihohae did have a highly flexible neck and the ability to quickly snap its jaws from side to side – although with a relatively weak bite force, suggesting it was primarily tackling small soft-bodied prey that could be easily swallowed whole.

Overall its feeding ecology seems to have been similar to modern sawfish, stunning prey such as squid with rapid slashing swipes of its jaws.

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[ltwilliammowett]

Mariner's compass, dry card, by C.R. Sherman, New Bedford, 19th century

[mintytrifecta]

My gender is whatever the fuck armillary spheres, planispheres, astrolabes and sidereal compasses have going on

[batfam-nalu-onepiece]

Luffy: Hey everyone! I want you to meet my new friend. His name is Tra-guy! Say hi!

Law: Hello. I’m not his friend. We are just working together. I’m only here for a little, then I’m leaving

Sanji: Hey welcome to the crew

Law: Crew? No like I said, I will only be here for a little while. A week or two tops

Sanji: Yeah sure. Luffy liked you. So you’re a part of our crew whether you like it or not. Hell, I refused him outright like three times but he made me join

Law: He..made you? Are you like his prisoner?

Sanji: No no, we’re cool now. He just doesn’t give up until he gets you on his crew. It’s not just me too.

Law: Not just you……*looks to the rest of the Strawhats* How many of you didn’t want to join his cree at first?

Zoro, Nami, Chopper, Franky raise their hand

Nami: Really only Robin and Brooke were the ones who wanted to be here. Ussop was in the middle. Luffy said “we’re friends so get on” and he came happily but everyone else..

Law: That’s…so he built his crew by just seeing people he likes and making them part of his crew? No wonder you are all so……odd

Nami: Odd? You should feel lucky! We stopped him from inviting a guy stuck in a treasure box, A tree-Zombie and a unicorn-zombie that were drinking sake, A pair of Legs and a centaur.

[o-link]

Sailing

[iviin-855]

Au where everything is the same except Eliot Spencer was one of the fighting cooks of the baratie

[skialdi]

A super fun commission for @forevertableflip / @raedoodles ~✨

Rear Admiral Washi belongs to her. Taiki is mine 🙏🏻 Thank you for your kind support.

[greendalmatian]

making a crossover that is so self indulgent. persona 5 in one piece :p

[wingodex]

i have this fic idea i've been thinking of for a little while and i think i really need to write it soon because the fact that i haven't yet is starting to make me act out. so i read this fic the other day and in it nami had to find a nearby island for the crew to land on, and in my head i thought, "wow this is the perfect opportunity to show nami using wayfinding and other non-log pose types of marine navigation" and then the fic author did not do any of that because that's my idea and my headcanons, and i got kind of mad and disappointed about it. like, i was upset that this random author had offhandedly brought up navigation and hadn't taken the opportunity to expand on grand line navigation without relying on a log pose, something that i've never seen anyone else do either, so i dunno why i was holding it against this one specific person. it was just so silly and irrational of me that i had to to put down my phone and do something else.

[philoursmars]

Il y a une dizaine de jours, je suis parti retrouver Christine à Narbonne.

Le Musée Narbo Via, dédié à la Narbo romaine (cette ville fut la première ville romaine hors d'Italie et un des 3 plus grands ports de l'Empire romain)

Ici quelques maquettes de navires romains :

un ponto : trois-mâts hauturier.

vue d'ensemble.

le (ou la ?) ponto.

une corbita : navire de commerce.

une horreia = une allège portuaire (bon, qu'on sache bien que je ne sais même pas ce qu'est une allège...apparemment c'est une embarcation prévue pour de courts trajets, des transferts de marchandises...)

une scapha, sorte de petite barque.

les 2 dernières : maquette de l'épave d'allège trouvée à Mandirac, halée par des hommes.

[alphynix]

Strange Symmetries #19: Wonky Whales

Toothed whales – the branch of cetaceans that includes modern dolphins, porpoises, beaked whales, and sperm whales – have surprisingly asymmetrical skulls, with some of the bones skewed to one side and just the left nostril forming their blowhole.

Some of the most obvious external manifestation of this lopsidedness can be seen in sperm whales, which have their blowhole at the front left side of their head, and in male narwhals, which usually have a single left-side tusk.

This sort of asymmetry first appeared in the skulls of early toothed whales around 30 million years ago. And since the highest amounts of wonkiness have gone on to develop in lineages that hunt in dark, cluttered, or murky waters, this suggests that the trait is somehow linked to the evolution of complex echolocation.

Some ancient members of the river dolphin lineage also had some additional unusual asymmetry, sometimes having slightly sideways-bending snouts.

Ensidelphis riveroi was one of the weirdest of these, living around the coasts of what is now Peru during the Miocene, about 19 million years ago. Around 3m long (~10'), it had a very long narrow toothy snout that curved distinctly off to the right along its length.

It's not clear what the function of this bend was, or even if the only known skull actually represents the normal condition for this species. But Ensidelphis' bendy snoot might have been used to probe around in muddy seafloor sediment or to extract prey from crevices, possibly like an underwater version of the modern wrybill.

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