IHADSS

The monocle

The symbology is drawn on the helmet display unit (HDU), a monocle in front of your right eye. To use it:

1. Wear the IHADSS helmet. Without it the monocle cannot come down, and nothing follows your head.
2. In the cockpit, click HDU stowage to bring the monocle down (see the cockpit tour). Click it again to stow it.
3. Turn on power. The symbology needs both the AC and DC buses.

The monocle is stowed each time you get in. It is also stowed if you take the helmet off, or turn on Arma’s own night vision outside the optics view.

On the helmet the symbology shows in the first person view only. Behind it, the monocle can show a picture: your night vision sensor, or for the CPG the TADS.

Which symbology you get

There are two formats: flight and weapon.

On the helmet the symbology is green and spread out to fill the monocle. In the CPG’s TADS optics view (heads down) it is white and compact. The VIDEO page can show either crew station’s symbology on an MPD.

Flight symbology

Flight symbology has four modes. The mode belongs to the aircraft, so both crew stations see the same one. It starts in transition.

Binding	Action
Symbology Select UpShift+B	Transition, or cruise if you are already in transition.
Symbology Select DownCtrl+B	Hover, or bob-up if you are already in hover. Selecting bob-up stores where you are and your heading.
Symbology Select PressB	Opens the FLT page on your left MPD.

The radial menu has the same choices under HMD.

Mode	Shows
Transition	Velocity vector to 60 kt, horizon line, waypoint data.
Cruise	Pitch ladder, bank, barometric altitude, waypoint data. No velocity vector.
Hover	Velocity vector to 6 kt. No attitude, no waypoint data.
Bob-up	Hover, plus a box over the stored point.

Transition

1. 1Heading Aircraft heading, on a tape covering 105° each side.
2. 2Command heading Bearing to the next waypoint.
3. 3Torque The higher engine torque. Boxed at 98% and over; flashes when the engines are more than 12% apart.
4. 4Airspeed True airspeed in knots. Boxed at VNE.
5. 5Acceleration cue Where the velocity vector is heading.
6. 6Velocity vector Speed and direction over the ground. The top of the lubber line is 60 kt.
7. 7Head tracker The aircraft’s nose.
8. 8Flight path vector Where the aircraft is going. Shown over 5 kt ground speed.
9. 9Fly-to cue The next waypoint.
10. 10LOS reticle Your line of sight.
11. 11Horizon line Bank, and pitch at a quarter scale.
12. 12Radar altitude Height above the ground in feet. HI over 200 ft, LO under 33 ft.
13. 13Vertical speed and radar altitude scales The pointer is climb or descent, the ends of the scale 1,000 ft/min. The bar is height above the ground under 200 ft.
14. 14Waypoint data Next waypoint and distance; ground speed and time to go.
15. 15Trim ball Centre it with the pedals. Here the aircraft is out of trim.
16. 16Field of regard The box is where your head points within the PNVS’s reach; the dot is the acquisition source.
17. 17Sight Your selected sight.
18. 18Range The range in use and its source.
19. 19Acquisition source What the cueing dots point to.

The velocity vector grows from the reticle in the direction you are moving over the ground. Its full length, to the top of the lubber line under the heading tape, is 60 kt. The acceleration cue, the circle, shows where the vector is heading.

The horizon line banks with the aircraft and moves a quarter as far as the real horizon in pitch, stopping at 30°. It sits a little below the reticle in level flight.

Cruise

1. 1Pitch ladder Solid above the horizon, dashed below, at half scale.
2. 2Bank triangle Bank angle, read against the lubber line.
3. 3Attitude hold Box around the airspeed while attitude hold is on.
4. 4Altitude hold On the vertical speed scale while altitude hold is on.
5. 5Barometric altitude Feet, in cruise only.
6. 6LOS reticle Drawn bold in cruise.

The pitch ladder moves half as far as the real horizon: rungs every 10° to 30°, then 45° and 60°, solid above the horizon and dashed below. CLIMB and DIVE mark straight up and straight down. The bank triangle turns about the reticle; read it against the lubber line. The reticle is drawn thicker.

Hover

1. 1Velocity vector Drift over the ground. The top of the lubber line is 6 kt.
2. 2Acceleration cue Where the drift is heading. Keep it on the reticle to stay still.
3. 3Command heading Still the bearing to the next waypoint.
4. 4Attitude hold Attitude hold is on.
5. 5Radar altitude scale Height above the ground, under 200 ft.

In hover the velocity vector’s full length is 6 kt, so it shows small drift. The acceleration cue starts at the vector’s tip up to 6 kt, and at the reticle above that. Hold the vector and the cue on the reticle to stay over one spot.

Bob-up

1. 1Bob-up box The stored hover point. Fly it back over the reticle.
2. 2Stored heading The heading when bob-up was selected.
3. 3Velocity vector Moving back towards the point.

Bob-up adds an octagon, 12 ft across, over the point stored when you selected it. The edge of the display is 40 ft away; further than that, the box waits at the edge. The command heading caret shows the stored heading instead of the next waypoint.

Symbols in the world

Three symbols sit on things outside the aircraft, so they move as you turn your head. They show only on the helmet, with flight symbology.

Flight data

Symbols in every format

Heading tape. The aircraft’s heading, 105° each side. Under it:

• the command heading caret: the next waypoint in flight symbology, the stored heading in bob-up, and the TADS azimuth in weapon symbology;
• a filled triangle for the other crew station’s sight: their head with the HMD, or the TADS. It needs someone in the other seat; a pilot with an AI CPG sees the TADS;
• with the radar fitted, a pair of marks on the FCR centreline.

Reticle. Your line of sight. It flashes when your sight or night vision sensor is at its limit, and when the gun has failed with the gun actioned.

Cueing dots. A dot on the side of the reticle towards your acquisition source, on each axis where it is more than 4° away. Follow them with your head, or with the TADS when it is your sight.

Cued LOS reticle. A dashed cross on the acquisition source itself, when it is in view.

Field of regard. The box under the reticle. Its outline is the sensor’s reach: the PNVS’s for the pilot, the TADS’s for the CPG. The small box inside is where you are looking; for a CPG whose sight is not the HMD, where the TADS points. The dot is the acquisition source. With the radar fitted, a solid line is its centreline, and a dashed line where the last scan looked.

Weapon symbology

1. 1Sensor The TADS sensor in view.
2. 2FOV brackets What the next narrower field of view will show.
3. 3Other sight Where the pilot’s sight points.
4. 4Lasing Shown while the laser fires.
5. 5Cueing dots Slew this way to find the acquisition source.
6. 6Airspeed True airspeed in knots.
7. 7Sight TADS selected.
8. 8TADS azimuth The caret shows where the TADS points.
9. 9TADS reticle The short marks at the ends show LMC is on.
10. 10Constraints box Missile constraints: solid when the reticle is inside, large when a missile can lock on before launch.
11. 11Radar altitude Height above the ground in feet.
12. 12Acquisition source PHS: the pilot’s helmet sight.
13. 13Weapon CMSL: the CPG has missiles. Below: trajectory and missile mode.
14. 14Range Laser range in metres, marked with a star.
15. 15Field of regard The box is the TADS within its limits; the dot is the acquisition source.

The CPG’s weapon symbology is built around the TADS:

• TADS reticle, with longer arms than the helmet reticle.
• Sensor in use, top left: DTV, FLIR or DVO.
• Field of view brackets: the corners of what the next narrower field of view will show.
• LMC marks at the ends of the reticle arms while the linear motion compensator is on.
• Lasing marks: four diagonals around the reticle while the laser fires.
• Airspeed and radar altitude either side of the field of regard.

The brackets, LMC and lasing marks show in the TADS optics view, and on the helmet with the TADS picture.

Weapon symbols

These appear in either format.

Missile constraints box

With missiles actioned, a box shows whether the Hellfire is within its launch constraints. It is placed so that the reticle is inside it exactly when it is.

Box	Meaning
Solid	Within constraints.
Dashed	Outside them.
Large	The missile can lock on before launch: a laser missile sees a matching laser spot, or a radar missile has a target it can take.
Small	It cannot.

The constraint is 7.5° from the line of sight, 20° with a lock or for a radar missile, and 5° for a radar missile tracking a target inside 1 km. A radar missile shows no box until one is powered and aligned. For laser missiles on LO or HI, the box is measured to your B5 coordinate point; with no point there it sits on the reticle, dashed. See AGM-114 Hellfire.

Rocket steering cursor

1. 1Rocket steering cursor Turn until it is centred on the reticle. The reticle inside its height means the pylons can reach.
2. 2Flight path vector Below the nose in the dive.
3. 3Range M: a manual range of 3.0 km.
4. 4Weapon PRKT: the pilot has rockets. Below: type, mode and rockets left.

With rockets actioned, an I-beam shows where the rockets will go. Across, it is the direction of the rocket solution from the nose: turn the aircraft until it is centred on the reticle. Up and down it shows the pylons: with the reticle inside its height, the pylons can reach. It is dashed while the rockets are inhibited. See Hydra 70 rockets.

Fixed gun

With the gun in FXD, the cued LOS reticle marks where the fixed gun will hit at the range in use. It moves down the display as the range grows. See M230 cannon.

Radar targets

With C SCP on, the radar’s targets are drawn where they are, with the next-to-shoot and alternate marks; in TPM, the obstacles. See FCR.

High action display

The HAD is the text along the bottom of every format.

Sight status

One message shows at a time; the highest in this list wins.

Laser codes are set on the COM pages; see Laser.