to the us navy
as nelson you go one after one
you need toknow -more orless- whether you attack the  cannons and fortressor 
the frotress and the ships forward
you nedd a programmist
to put echolot
the mean to find the mines and ships under the water like russian navals
eccolot 1 - forward
echolot 2 down

or 1-2
2-1

the russian already make this