Watchtower

Watchtower is a building.

Sets the shore's Defence Capacity and unlocks the heavier pieces. Sees incoming fleets earlier at higher levels.

Times are for a port with no Warehouse; a Warehouse takes a share off every one of them.

Level	Cost	Time	Gives
1	50 50	2 min	16 defence capacity
2	100 100	4 min	24 defence capacity
3	200 200	11 min	32 defence capacity
4	400 400	27 min	40 defence capacity
5	800 800	1.1 hours	48 defence capacity
6	1,600 1,600	2.8 hours	56 defence capacity
7	3,200 3,200	7.1 hours	64 defence capacity
8	6,400 6,400	18 hours	72 defence capacity
9	12,800 12,800 6	44 hours	80 defence capacity
10	25,600 25,600 12	4.6 days	88 defence capacity
11	51,200 51,200 4 12	12 days	100 defence capacity
12	102,400 102,400 8 12	29 days	112 defence capacity
13	204,800 204,800 16 12	72 days	124 defence capacity
14	409,600 409,600 32 12	180 days	136 defence capacity
15	819,200 819,200 64 12	450 days	148 defence capacity