<![CDATA[Inverted Airspeed calculator]]>The airspeed calculator gives wrong value because the temperatures orientation table is inverted. Negative temperatures should be to the left and positive to the right.

]]>https://community.justflight.com/topic/11193/inverted-airspeed-calculatorRSS for NodeWed, 12 Aug 2026 00:35:14 GMTTue, 11 Aug 2026 17:18:23 GMT60<![CDATA[Reply to Inverted Airspeed calculator on Tue, 11 Aug 2026 21:26:17 GMT]]>@Voxen Sure that you are comparing the TAS? If you take the GS from the GTN there is also a possible wind component included.

]]>https://community.justflight.com/post/53683https://community.justflight.com/post/53683Tue, 11 Aug 2026 21:26:17 GMT<![CDATA[Reply to Inverted Airspeed calculator on Tue, 11 Aug 2026 21:00:05 GMT]]>What was your indicated speed, and what did the GNS report for your TAS? Also, it shouldn't make that much of a difference, but the altitude you enter it not necessarily the altitude displayed on your altimeter. You need to set your altimeter to 29.92" to obtain your pressure altitude, and then enter that on the TAS calculator.

]]>https://community.justflight.com/post/53680https://community.justflight.com/post/53680Tue, 11 Aug 2026 21:00:05 GMT<![CDATA[Reply to Inverted Airspeed calculator on Tue, 11 Aug 2026 20:48:19 GMT]]>Okay maybe I don’t get how this works. Today I was flying at 6500ft with +20C so I aligned the 6.5 position below the +20 marker (on the left side) and the value I was reading on the bottom part was way more than what the GTN750 was telling me. So I aligned it below the -20 marker and there it was perfectly accurate.

]]>https://community.justflight.com/post/53679https://community.justflight.com/post/53679Tue, 11 Aug 2026 20:48:19 GMT<![CDATA[Reply to Inverted Airspeed calculator on Tue, 11 Aug 2026 19:59:32 GMT]]>image.png

Test: PA = 10,000, OAT = -20°C, IAS = 140
Result: 157
Actual: 158

]]>https://community.justflight.com/post/53674https://community.justflight.com/post/53674Tue, 11 Aug 2026 19:59:32 GMT