Pick the grid

The layout preview asks the video system for a grid. AUTO, PAL and BF43COMPAT all draw 30 columns by 16 rows. NTSC draws 30 by 13. HDZERO draws 50 by 18. DJIWTF draws 60 by 22. AVATAR and BFHDCOMPAT draw 53 by 20. The picture uses those eight results and nothing else. Press AUTO and the line reads AUTO · 30×16. Press DJIWTF and both bars fill, because 60 columns and 22 rows are the largest pair in the list.

The Screen card shows the lookup names as they are stored. DJIWTF is that stored name, not a label the app invents. The Betaflight canvas list, on a different firmware, calls 60 by 22 the grid for DJI O3/O4 and Walksnail, 50 by 18 the grid for HDZero, and 53 by 20 Betaflight HD. INAV does not open that canvas picker. Picking the video system is what changes the preview.

Betaflight's own video system is Auto, PAL, NTSC or HD. Auto previews as PAL there too, 30 by 16, and the canvas choices stay locked until the video system is HD. Switching Betaflight to HD resets the canvas to 53 by 20 until a digital VTX reports its own grid. That is a different card. Betaflight OSD editor is where that firmware's layout lives.

HD OSD full redraw every starts at 1.0 seconds. The field steps by 0.5 seconds and runs up to 60.0 seconds. The hint says this is for HDZero, Walksnail and DJI over MSP DisplayPort, and that a longer interval helps at the edge of range. It also says 0 means every frame, and that one step below 0 turns the redraw off, which it calls legacy mode. The demo's 1.0 seconds is neither of those. It is a full redraw once a second.

Software blinking starts off. The hint says to turn it on if warnings that should flash are invisible. That switch does not move the alarm numbers. Those stay on the Alarms card, and OSD alarms is where altitude starts at 100 m and RSSI starts at 20%.

Antenna tracker telemetry starts on Off. On draws tracker data on the top row of the video. Test repeats that row on row 4, where you can see it. Units start on METRIC. The choices are IMPERIAL, METRIC, METRIC_MPH, UK and GA. Changing units does not change the alarm thresholds, which the Alarms footer keeps in metric.

Open the OSD tab on INAV and find Screen. Chrome or Edge connects over USB or Bluetooth. Android adds Wi-Fi. iPhone uses Bluetooth or Wi-Fi and has no USB host. Pick the video system that matches the goggles, then look at the layout line. It should show that name and the grid above. Save after the elements still sit inside the new cells.

The horizon is a different card. OSD horizon matches the camera uptilt to the line in the picture. It does not change 30 by 16 into 60 by 22. If the preview is still 30 by 16, the video system is still AUTO, PAL or BF43COMPAT.