Archer's Advantage allows you to sight in using two methods.  The preferred method is to sight in at two ranges and let the program calculate speed from those two sight settings.  Alternatively, you can shoot through a chronograph and sight in at one range.

However, it is nearly impossible to find two chronographs that give you the same calculated speed.  It is unrealistic to expect Archer's Advantage marks to precisely match your chronograph speed.   Many shooters use the Chronograph method with satisfactory results.  However, your best results will always be obtained by using the Calculate Speed Method to sight in your bow.