Righto, so time for the update!
Bob has located mackoti's borders. Assuming that's his capital (we'll be able to confirm this next turn), it's 17 tiles west and 4 tiles south of luddite's capital. Works out perfectly with the 15-20 tiles E-W I was predicting between capitals.
James Cook continues to unveil the south-west. We'll have a Settler ready in 2 turns -
we need to decide now whether to settle the Pig-Gold or Corn-Fish-Gold-Gold site first. Personally I'm leaning towards Pig-Gold, because it gets up and running a lot faster and still leaves the other site open. We won't have Fishing for at least 20 turns, so the Fish would also be useless at the other site before then - leaving us with a crappier food resource for much of the city's early life and 10 turns' wait to even start hooking up the Gold, and greater maintenance costs. Not good. Anyway, getting those two Priests running ASAP is an attractive bonus of going for Pig-Gold first.
Assuming we go for Pig-Gold first, we may want to go for Corn-Fish-Gold-Gold second. That or going for the Pig-Gems a little further south of that site.
Joe continues to explore the south. We've passed the equator now (as revealed by Stonehenge), so I expect we should be encountering our southern neighbour within 10-15 tiles. Looks like the north-south dimensions are somewhere in the vicinity of 50-60 tiles, from counting to halfway and doubling it.
Max has just encountered the top of the map, so we can confirm that it's cylindrical. This is also interesting because it means we definitely don't have any easy land connection to our eastern neighbour. This is good in a way because it means we can safely go with very light defences in the east for much of the early game.
Not quite sure where to plan cities around that area. Looks like there might be quite a decent spot to grab those Furs though, with plenty of food.