The Legend for the Nav map...
From top left, down :-
Spy
Comando
Sink
Recon
Reach location
Supply drop
Intercept convoy
Left center :-
Refit milkcow
Patrol
Right Center :-
Allied Navelbase
Axis Navalbase
Nautal Navalbase
Allied Airbase
Axis Airbase
Nautral Airbase
Open tree for bases
Close tree for bases
Uboat base
Right side :-
Fighter
Bomber
Cruser
Battleship
U-boat
Objective
Aircraft (?) Range. ----- (im not 100% on it being Aircraft, but it looks like Aircraft)
The legend for the TAI :-
Sonar
Visual
hydrophone
Radar
Torpedo range
Hows that for good eyesight (and guesstimate).
Hope that helps.