Map Making (C-evo)

Map Making in the free game C-evo can be researched very early and may have immediate benefits as well as leading to longer-term gains, particularly related to water.
The earliest benefit is usually the addition of points to s containing s.
Its most important value is usually allowing the designing and building of s - but that depends on the amount of water available for them, which can be insignificant if the has a high proportion of tiles. Such units have a cost of 8, which is not increased by but goes up to 10 if you have researched . See C-evo advances affecting naval units for details.
Map Making leads to , which allows the building of s, adding points to al water tiles
The other value is enabling a nation to build "The ", a that adds yield to al water tiles, though it may eventually be obsoleted.