IAS to TAS conversion
Can anyone point me in the right direction to find the accurate formulae to cinvert IAS to TAS both direct and via the Mach route. I've got the formulae from Ed Williams' Aviation formulary but it seems to give consistent high figures compared with my trusty RAF MK4B computer. Alternatively, if anyone's cruising at Mach 0.82 at FL350 ISA, let me know what the FMS says for TAS.
Remember, it has to go up, but landings bite if you get them wrong.