I think this is a fascinating subject with a lot of potential, and I rarely see "make the world better/less worse!" propositions outside of closely modern, political TLs or WIs. This is great discussion and food for thought,
Isfendil.
Any incitative would certainly not come from political crisis. If these should birth technological advance would it be only half of the time, we'd be exploring the universe right now.
What was the incitative to better naval technology IOTL? Less being reliant on trade, than a virtuous circle involving competition for accessing far trade centers one knew existed in Africa, or circumventing the relative obstacle to already existing trade.
Simply said : a monopolizing Phoenicia would have less incitative finding other ways to assert its dominance.
That's just the incitative tough : you need to meet it with technological advance (whom History points how less than obvious it was), and enough structurated network to make the cut from traditional clientele not that harmful.
Hm, I think I misrepresented the idea if this is what you got from it. I'm imagining a political crisis spurs the creation of two, (geographically) opposite facing, vaguely hostile merchant states. If a state with an elite class rooted in maritime trade is stuck facing the Iberian Atlantic, would there be incentive for them to start trading with OTL Ivory/Gold coast? I'm imagining this to be a slower process built from a political catalyst with long term regional effects.
The monopolization wouldn't be happening here: there's a reason *Phoenician influence would be ejected from the Eastern Med homeland. Some collapse or invasion ejecting elites (and their wealth, skills, and inclinations for trade) to far flung Iberia would be the key here, no business-as-usual for the Phoenicians. Maybe a bigger initial boom makes them an earlier, riper target for their OTL conquerors (or their ATL stand-ins) who invade ahead of OTL schedule.
What you'd need would be a long enough naval tradition in coastal Atlantic and Mediterranean seas, metallurgic development (would it be only to ships structure)
Eventually, you'd need a really, really big incitative for any ancient civilisation to go blindly westwards : nobody knew that you had lands there, thinking about it as a big, empty and merciless oceans with few random archipelagos. It's quite possible that ancients discovered Azores IOTL, but the sheer distance really cooled them off.
Historical experience sems to prooves the exact contrary : simply said, Mediterranean (or any inner sea) navigation have a really distinct feel,
especially when it comes to winds or streams.
Not that the difference is unsufferable, but it requires a different "how-to" and modification of ships structures as it happened with medieval cogs until the XIVth, when carvel built allowed ships to make the difference more easily (especially with its structural strength).
Romans merchant ships could have technically made the trip, but not after a month (at best) of solitary, contrary to dominant winds, more or less hopless trip. Assuming they went straight from Spain to Carribeans or Brazil.
Fascinating stuff! I'm very much out of my element when discussing how one kind of navigational knowledge here might help or hinder the development of similar-but-fundamentally-different technological growth. In your opinion, would this kind of technology at least be better suited to coastal navigation, if not oceanic?
I think this the key struggle with how to get a (much!) earlier navigational-focused or obsessed culture. Tghere's cetainly plenty of reasons it didn't happen OTL. To fit the OP, one path might be to make a culture that has the experience seeing wealth/success in trade, but is forced out of their early incubation period into a broader scope or ambition. Greater Med Phoenician Disapora --> *Stronger Iberian-Phoenician Hybrid --> said hybrid excluded from Med to develop Atlantic/oceanic navigation on a level above local fishermen or small merchants of OTL.
Is there a good reason we can brainstorm to travel or explore semi-blindly Westward? Rumors of Basque/Irish fishermen getting to Newfoundland fisheries and Portuguese sailors getting to the edges of (at the time, backwater) Brazil ahead of reported exploration dates are fairly credible... but they have a millenia's memetic and technological advantage over our *Phoenician-hybrid outcasts.
Even if things can't get to that level before, say, 1000AD, I think a few good centuries' headstart on exploration and navigational technology helps to fit the aim of the OP. I'm not looking for
this culture to become oceanic, but their distant descendants to have more of a nautical base earlier. For such wide reaching effects as described in the OP, we need to start really early, even if does mean that the butterflies get a little unmanageable to say the least.
I'm not sure : cabotage is a fairly easy way to migrate and trade (for supply in the former, to the center-by-center early trade). Coastal navigation is more or less simpler and critically safer. The distance between Indonesia and East Africa is roughly the same, and with similar problems : we have a rich, known coast up north; and a big, empty, risky unknown south.
And contrary to what happened in Atlantic, you have no real hope finding something remotly interesting in south Indian Ocean.
To be honest, I'd rather see Persian/Arab/East African trade develloping direct ocean travel sooner than Indonesian/Polynesian.
But, arguably, I'm not that confident enough on this for I wouldn't accept a contrary opinion.
Hm. Interesting combination with the East African *Zanzibar (or more Northerly *Somalian?) complex with Indonesian trade. Maybe make the Indian subcontinent enduringly hostile to East African or *Arab merchants, who desperately want...Indonesian spices?
Certainly this could mimic the hostility of the Islamic world to Christendom, which took the long way round Africa when the need presented itself. If we can create a difference in supply/demand for some ~exotic good~ with accompanying prices, the risk/reward could be tilted in favor of skipping a hostile India in favor of a hostile Southern Indian Ocean. Maybe smaller island that are, in today's world, total backwaters, become important waystations and ports for resupply. (the Maldives as a biggie? OTL Port Marianne [[edit/clarification:
British Indian Ocean Territory]] as the laughably small counterpoint?)
I wouldn't discount possible cross pollination of this East African/Indonesian trade complex with polynesian ocean farers. Polynesians spread remarkably far (albeit, remarkably
late for our navigation-happy ATL) with comparatively ~simple~ (imo, simply effective and efficient) technology, knowledge, and navigational instrumentation comparative to concurrent European explorers.
It wouldn't be surprising that lateen sail in Mediterranean sea may have been originated from a polynesian or east asian feature IOTL, tough. It's not clear how much polynesian seafare made it to Asian seafare (altough you probably have room for embetterment).
You'd really need repeted occurences for that to be efficient tough : pandemics in America didn't occured from one encounter, but several involving Americans and Europeans (with their cattle) in the XVth and XVIth centuries.
And giving the long biological estrangement, I wonder how much native population in Americas wouldn't be distinctivly more vulnerable even after the first outerbacks. But that's another point.
Hm, I'm not envisioning an early, one-time contact, especially given the propensity for plagues to burn themselves out in smaller ships and crews. I'm thinking the contact would need to be sustained enough that merchants would have an interest in establishing themselves on new continents permanently: a small [*Iberian-Phoenician descendant culture] enclave in a trade port on the tip of Brazil with regular, [*Ivory/Gold coast] contact in ~the ATL 1300s could certainly lead to some interesting disease exchanges and/or recoveries before an ATL ideology/technology was advanced enough to warrant an attempt at imperialism.
Ultimately, I envision the best way to answer/solve the OP's question is to aim for more advanced navigation concurrent with less advanced weaponry, less advanced industrialization, and less virulent/developed colonization-focused ideologies.
Anyone else seeing different methods of attacking the issue, either in terms of their understanding--differently-balanced or other factors-- or approach? I have almost no idea how to keep navigation on the same path but make weaponry/the ideological and economic drive for OTL colonization efforts less virulent.