I am reading the contents of Lvar 'ngx_SPDwindow' so I can display the aircraft's speed on an LED display in my control panel.

 

This works fine for the 737, for both knots and mach speeds.

 

However, for the 777, knots speed is fine, but the mach speed always returns me a value of '1', instead of say '.834'.

 

I have also tried reading offset 0x6540, but I am unable to make sense of the values there.

 

Any ideas?

 

Chris.

 

 

Got it...

 

 

The answer was in understanding offset 0x6540 better.

 

I now have the T7 displaying correctly both knot speed and mach spreed in my MCP and both dial correctly.

 

Chris.