I knew something was up when I said they were close to (1km to feet) / 
60. I took the 900m part out of the formula but didn't add a 60 part, 
didn't check it properly. These are correct. And now accurate to a foot :)

static double pressure_data[][2] = {

  { 0.00, -0.001081226 },          // Not a guess anymore.
  { 2952.76, -0.000990846 },       // It's the delta difference * inHG.
  { 5905.51, -0.000906363 },       // These values are actually 
(delta(alt+0.5)-delta(alt-0.5))*29.92
  { 8858.27, -0.000827504 },
  { 11811.02, -0.000754005 },
  { 14763.78, -0.000685607 },
  { 17716.54, -0.000622061 },
  { 20669.29, -0.000563121 },
  { 23622.05, -0.000508553 },
  { 26574.80, -0.000458125 },
  { 29527.56, -0.000411614 },
  { 32480.31, -0.000368806 },
  { 35433.07, -0.000329489 },
  { 38385.83, -0.000287638 },
  { 41338.58, -0.000249581 },
  { 44291.34, -0.000216559 },
  { 47244.09, -0.000187906 },
  { 50196.85, -0.000163044 },
  { 53149.61, -0.000141472 },
  { 56102.36, -0.000122754 },
  { 59055.12, -0.000106513 },
  { 62007.87, -0.000092420 },
  { 64960.63, -0.000080192 },
  { 67913.39, -0.000069370 },
  { 70866.14, -0.000059989 },
  { 73818.90, -0.000051907 },
  { 76771.65, -0.00004494  },
  { 79724.41, -0.000038932 },
  { 82677.17, -0.000033746 },
  { 85629.92, -0.000029269 },
  { 88582.68, -0.000025399 },
  { 91535.43, -0.000022054 },
  { 94488.19, -0.000019161 },
  { 97440.94, -0.000016656 },
  { 100393.70, -0.000014487 },
  { -1, -1 }
};

Btw, I've never used a mailing list before. Hopefully this ends up as a 
reply of my first message.

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