THE SPAWNER
Walk on the spawner and note the coords of the spawner when you are on it. For the X and the Z coords, please round the coord at the .5 ; so that for example, X=-237.395789632 will be X=-237.5 and Z=539.613648928 will be Z=539.5
Only a number finishing by .5 is correct for the X and the Z of a spawner.
For the Y of the spawner, just enter the Y of your feet when you walk on the spawner. The program will calculate the correct Y for you from the position of the feet.
X=
Y=
Z=

THE PLAYER
Note the coords of the player with the number of figures you want after the point. No need to round anything.
The Y of the player is the Y of the feet.
X=
Y=
Z=

By clicking on compute, the distance between the spawner and the player will be calculated, so that you will know if the player will activate the spawner or not from his position.