#define M_CHOPPER bit(16) /* can hold choppers */
#define M_OILER bit(17) /* can re-fuel ships */
#define M_SUPPLY bit(18) /* Can supply units/sects/ships */
+#define M_CANAL bit(19) /* Can navigate a canal (BIG CITY) */
#define M_ANTIMISSILE bit(20) /* Shoot down missile */
#define getship(n, p) \