Discussion on volume calculation

I have several doubts related to volume calculation

1.Does we need GCP foe more accurate volume determination ? and Normal geottaged images in geographical cooradinates is enough for reliable results between 90-95% of accuracy which gives better result ?

2.Does trail version of pix4d gives wrong result compared to actual volume of the pile.

3.I have calculated volume in pix4d and global mapper it gives large difference in both the results?

4.Give me any suggesion i need to achieve 90-95% of accuracy in volume calculation.what are the steps i want to follow 

Please suggest me.......

 

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