SRD-728 The AOPS shall have a primary gun weapons system 
that: 
a.  has a calibre of between 20mm and 40mm, 
b.  is stabilized, 
c.  provides clear firing arcs over an arc of not less than 
45 degrees abaft the beam on one side, through the 
bow, to an arc of not less than 45 degrees abaft the 
beam on the other side, 
d.  has elevation limits not less than 10 degrees below 
the horizontal and 80 degrees above the horizontal, 
e.  has dual ammunition feed system that allows the 
operator to select either of two types of ammunition 
instantly, 
f.  has selectable rates of fire, 
g.  has the ability to display firing arcs and gun vector 
line, 
h.  is integrated with a laser range-finding system, 
i.  is integrated with a single on-mount or off-mount all- 
weather, day and night, electro- 
optical fire control system for weapon target designation 
in manual and automatic modes, 
j.  requires no more than a single operator, 
k.  receives surface target designation from the 
navigation radar, 
l.  supports automatic collection of video and other data, 
and 
The gun weapons system will be selected 
or detailed requirements will be developed 
by PMO AOPS during definition. 
The electro-optical system could include 
television, IR and thermal imaging 
elements and should be capable of electro- 
optic surveillance independant of the gun 
system. 
The location of the weapon system shall 
take into account maintenance 
requirements, weather effects on the 
system and facilitate the load/un-load and 
operational use. 
A gun calibre of between 20mm and 40 
mm is likely appropriate.