The auto guns are of three types
GNA - Armored Auto Guns
GNH - Hard Auto Guns
GNG - gun Emplacements
The other gun types are
BAA - Armored Gun Battery
BAT - Gun Battery
BAS - Soft Gun Battery
Aside from the guns you can see in the hangar (i.e. - mannable gun positions):
The Destroyers have 3 BAAs (equivalent to 5in), 4 GNGs (equiv to a field auto ack) and 4 GNHs. 17 total guns including mannable.
The Cruiser has 4 GNAs, 4 GNHs, and 10 GNGs. 27 total guns including mannable
The CV has 2 GNAs, 48 GNGs, and 7 GNHs. 71 total guns including mannable.