dunkleosteus
Roman Pleb
Civ6 really downplays the usefulness of boats and navies. Most cities aren't built on the coast, making naval invasions impractical and effectively makes naval advancement supplementary at best. This is bad though, both for gameplay and historicity. The ocean is big and wide and incredibly important. If civ 6 wants to bring boats back, I think the best way to do it is with trade. Civ5 made a distinction between sea and land trade, whereas civ6 does away with this. As far as I can tell, there is no difference in value between the two, but this is categorically false.
Data on low-tier Roman merchant ships show that they had a capacity of 70 metric tonnes of grain (10 000 modii, http://www2.rgzm.de/navis/Themes/Commercio/CommerceEnglish.htm)
An animal- or human-powered land-based transport would take much more effort to accomplish this: boats can sail day and night, at relatively high speeds without the need to rest, eat or sleep. Sailors bring food and water for themselves and with a day and night crew, can operate around the clock.
(Historically, wind patterns and poor sail design actually did limit trade in the mediterranean, they were limited to sailing at a very acute angle from the wind, so they often had to zig zag a lot and could sail from Rome to Egypt for half the year (when winds blew towards the south east) and back to Rome the other half of the year (when they blew north west).
Regardless, a single small ship is much more effective, wikipedia gives the value that sea commerce was 60 times as cost effective for the Romans compared to land trade.
Make sea trade economically necessary and the sea comes back to the forefront of importance.
Data on low-tier Roman merchant ships show that they had a capacity of 70 metric tonnes of grain (10 000 modii, http://www2.rgzm.de/navis/Themes/Commercio/CommerceEnglish.htm)
An animal- or human-powered land-based transport would take much more effort to accomplish this: boats can sail day and night, at relatively high speeds without the need to rest, eat or sleep. Sailors bring food and water for themselves and with a day and night crew, can operate around the clock.
(Historically, wind patterns and poor sail design actually did limit trade in the mediterranean, they were limited to sailing at a very acute angle from the wind, so they often had to zig zag a lot and could sail from Rome to Egypt for half the year (when winds blew towards the south east) and back to Rome the other half of the year (when they blew north west).
Regardless, a single small ship is much more effective, wikipedia gives the value that sea commerce was 60 times as cost effective for the Romans compared to land trade.
Make sea trade economically necessary and the sea comes back to the forefront of importance.