abct = [tIghta;tIghtb;tIghtc;tIghtt]

abct =

  1.0e+004 *

  Columns 1 through 3

   2.614187450296970   2.647752847066399   2.577117412269296
   0.475027343316860   0.217690719892920   0.646582218629081
   0.004690182422228   0.040799648580344   0.006802788479844
   0.000009125723893   0.000009098039886   0.000009123757901

  Column 4

   2.656855967684253
   0.023676121195969
   0.014311123844120
   0.000009118963744

tightTruePos = GPSCalc([0;0;6370;0],zeros(4,1),abct)

tightTruePos =

  1.0e+003 *

  -0.019052999999344
   0.011318000000093
   6.369999999999642
   0.000000100000000


randi([-1,1],4,1)

ans =

     0
     0
     1
     1

randi([-1,1],4,1)

ans =

    -1
     0
     0
     0

for i=1:15
err(:,i) = GPSCalc([0;0;6370;0],randi([-1,1],4,1),abct);
end
for j=1:15
tightInfNorm(j) = norm(tightTruePos-err(:,j),inf);
end
tightInfNorm

tightInfNorm =

  Columns 1 through 3

   0.725620990017308   0.446325840288409   0.648205616566166

  Columns 4 through 6

   0.689963031827574   0.716325437204997   0.725578687378469

  Columns 7 through 9

   0.425817674037717   0.539542181505336   0.243632724300369

  Columns 10 through 12

   0.487266519946388   0.539564286755741   0.507764689554278

  Columns 13 through 15

   0.362805207216311   0.425811928816074   0.182180797586625

max(tightInfNorm)

ans =

   0.725620990017308

tightErrMagFact = ans/.003

tightErrMagFact =

    2.418736633391028e+002