Position averaging when taking a point
Locus is targeted to Smartphones and tablets - devices with a typically poor varying positioning accurracy.
I dont know how waypoint creation is exactly implemented, but I guess only the current GPS position is used. And as stated above this may be pretty inaccurate. Even dedicated GPS receivers offer position avaraging during waypoint creation to increase accuracy.
So when I need exact coordinates (think creating a new geocache) I am using an external app or my old Garmin for waypoint averaging. Would be great if Locus could support this natively.