Well, the prevaling premise of the world that has been told to me (What is its name again?) is "Its
like WWII never ended" That can be interpreted in two ways, Alternate Earth theory (
AET), and Divergent Earth theory (
DET).
AET is a completely different world, cherry picking different events that happen or dont happen, both natural and human influenced. Martin Luthor King Jr wasn't assasinated. The Norman conquest never happened. Middle east based monotheic religion didn't arise. Dinosaurs didn't go extinct at the end of the Cretaceous peroid. The major split of pangea went north-south and not east-west. The "like" in "
like WWII never ended" is the operating word when talking about AET. The whole world is different, it can barely be called Earth, as we know it. Thus it is coincidence that all the different cultures arose are so similar to cultures of our world.
DET is our world, but is "Like WWII never ended." If it never ended, what year are we? Did we nuke ourselves back into the stone age? Why is "China" right next to "Europe?" Why is "Russia" and "Japan" part of the same coolition? The theory I came up with, with a little help from Dick, is a gigantic tectonic event causing a geomagnetic reversal (
http://en.wikipedia.org/wiki/Geomagnetic_reversal). This, along with time and the use of superweapons, could cause the terrain to change into what we see in the current annum. This, along with land changing hands from war, could explain why these different cultures are situated where they are in Guns of Icarus. Furthermore, it also explains why ancient technology was lost; the chaotic effects of an unstable magnetic field would leave the world vulnerable to solar radiation, rendering many places and sensitive technologies useless, as well as kill of much of the flora and fauna in the world.
With DET, in which case radio transmitters have been invented in the past, but wwere lost and found again, I believe that short range radios are available and somewhat common. Every warship worth its salt has one equipped, I would also hazard a guess that galleons and larger ships have multiple radios; one for communicating with other captains, another for communicating with the crew.
Also, radar has been rediscovered, although a few nations have it, they're keeping it a secret.