ExA4K Posted December 20, 2019 Share Posted December 20, 2019 The standby compass (or wet compass) should show magnetic heading, but it appears to be showing true heading in the F-16. After alignment, the HSI will show magnetic heading - which should match the standby compass heading (IRL within a degree or 2). The DED INS page shows the True heading, and this matches what the standby compass is showing. In the attached image taken while stationary, the mag heading is 300 and the true heading 305 deg and the standby shows a heading of 305. Link to comment Share on other sites More sharing options...
Bouli306 Posted December 20, 2019 Share Posted December 20, 2019 The standby compass (or wet compass) should show magnetic heading, but it appears to be showing true heading in the F-16. After alignment, the HSI will show magnetic heading - which should match the standby compass heading (IRL within a degree or 2). The DED INS page shows the True heading, and this matches what the standby compass is showing. In the attached image taken while stationary, the mag heading is 300 and the true heading 305 deg and the standby shows a heading of 305. How sure are you that the EHSI should show magnetic? I think it is slaved to the INS/GPS. Link to comment Share on other sites More sharing options...
ExA4K Posted December 20, 2019 Author Share Posted December 20, 2019 The HSI shows Mag heading, (calculated from INS true heading and adjusted from a MagVar look up table). F-16 manual refers: Compass Card. Arrayed around the periphery of the HSI, this is a compass that rotates such that the top of the compass indicates the aircraft’s magnetic heading. Link to comment Share on other sites More sharing options...
Bouli306 Posted December 20, 2019 Share Posted December 20, 2019 The HSI shows Mag heading, (calculated from INS true heading and adjusted from a MagVar look up table). F-16 manual refers: Compass Card. Arrayed around the periphery of the HSI, this is a compass that rotates such that the top of the compass indicates the aircraft’s magnetic heading. You are absolutely correct.. Link to comment Share on other sites More sharing options...
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