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|  MIL-N-85005A(AS)
Software - The system shall be programmed to perform the
3.4.1.1.2
following basic functions.
(1) Inertial Measurement Set Management
(2) Navigation
(3) Control Panel Interface
(4) Display Interface
(5) System Self Test and Fault Isolation
Operating Modes - The system shall provide the capability
3.4.1.2
to navigate in a Geographical (GEO) or in a Tactical (TAC) mode of operation.
Within either GEO or TAC, the operating navigation solutions shall be Inertial
(IN), Auxiliary Inertial (XN), Dead Reckoning (DR) and Omega, with the following
capabilities:
Inertial velocities and barometric altitude.
(1) IN -
This is the pure inertial solution. It shall
be used for platform management and shall not
be susceptible to position update. It shall
be possible to update any other solution using
IN. It shall not be used for geographic or
tactical navigation.
Inertial velocities and barometric altitude.
(2) XN -
This shall be a separate, auxiliary, inertial
solution and shall be selectable for geographic
or tactical navigation. It shall be possible
to position update XN.
Doppler or true airspeed velocities, inertial
(3) DR -
or selected magnetic heading, and barometric
altitude. DR shall be selectable for geographic
or tactical navigation. It shall be possible
to position update DR. Within the DR mode,
the system shall automatically utilize the best
heading and best velocity sensor available
according to the following priority:
Best Sensors
Doppler - Inertial
Geographic Navigation
Navigator Specified
Tactical Navigation
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