New Technologies

1. Cartography 

- Ancient Era 

- The fog of war effect on the map already adds an interesting aspect to the game. Similar to that, before you discover cartography, it would be interesting if you couldn't keep track of the land you passed before. This may be entirely to annoying to play with, but in my head it sounds like a fun challenge in the early game. 

2. Paper money

- Medieval

- Could be something along the lines of economic gain for every trade route.

3. Trade Insurance

- Industrial or Early Modern

- Whenever somebody ransacks a trade route, the purchaser of the luxury or strategic good should be compensated. The ransacker shouldn't get any money via trade insurance.

4. Sonar

- Contemporary

- Should allow for modern ships to detect submarines and U-boats faster.