Match the camera

Camera uptilt is on the HUD and horizon card. It starts at 0 degrees and runs from -40 to 80. The hint says positive tilts up. Horizon follows camera uptilt is the switch under it, and it starts off. Its hint says it centres the horizon when flying at the uptilt angle.

The picture starts with both at the demo: uptilt 0, follow off, and the aircraft pitch at 0. The lamp says Level and the line is in the middle. Move the uptilt to 20 and leave follow off. The line stays level, because follow is what applies the camera angle to the horizon in this picture. Move the pitch to 10 with follow still off and the lamp says Nose up. The line drops. Pitch back through 0 and on to a negative number and the lamp says Nose down.

That pitch slider is not saved. It stands in for the aircraft. The saved pitch field on the card is Horizon pitch range, which starts at 20 degrees, from 10 to 90. The hint says it is the pitch at the top and bottom of the horizon. The picture will not pitch past 20, which is that demo range. Horizon height is a different field. It starts at 0 rows, from -2 to 2, and the hint says it moves the horizon, the crosshair and the sidebars up or down. The picture does not use that row offset.

Turn follow on with the uptilt at 20 and the pitch still at 0. The lamp says Below the camera. The line sits low, because the aircraft is not yet flying at the camera's uptilt. Raise the pitch to 20, the same number as the uptilt, and the lamp says Centred. The line returns to the middle. That is the hint: the horizon is centred when you fly at the uptilt angle.

Pitch past the uptilt and the lamp says Above the camera. The line rises. The picture moves one and a half percent of the frame for each degree, and it stops at the edge of the box. That spacing is the picture, not a claim about how many OSD rows INAV uses. The rule the picture keeps is the hint. Equal angles centre the line. Follow off ignores the uptilt.

The footer on the card says the camera angle and the field of view place the horizon and the HUD markers where they really are in the picture. Horizontal field of view starts at 135 degrees, from 60 to 150, in steps of 5. Vertical starts at 85 degrees, from 30 to 120, in steps of 5. Home arrows, the home marker and waypoint markers use that frame. The picture is only the horizon line, so those markers are not drawn. Crosshair style starts at Default, and horizon style starts at Default. The line style is a separate choice and needs a graphical OSD when it is set to Line.

Open the OSD tab on INAV and find HUD and horizon. Chrome or Edge connects over USB or Bluetooth. Android adds Wi-Fi. iPhone uses Bluetooth or Wi-Fi and has no USB host. Set the uptilt to the angle the camera is actually mounted at, then turn on Horizon follows camera uptilt if you want the line centred when you fly along that camera angle. Save.

This is not the launch climb. Launch holds 18 degrees after a throw. That pitch is the aircraft's launch angle, not the OSD camera. Dragging elements around the screen is a different job from this card. The horizon here is the angle match, not the cell the element sits in.