projectile launching device the invention includes a method of operating the system described herein comprising operation of a control device which selects from displaying the los aiming point or the true aiming point the invention includes a method of operating the system described herein comprising operation of a control device which actives the ranging device and displays the los aiming point when the control device is activated and deactivates the ranging device and or the los aiming point when deactivated the invention includes method of allowing the visual identification of the los and true aiming points by differences in color shape or modulation the invention includes a method of calculating the position of an adjustable aiming point for a projectile comprising calculating the elevation of the launch point the inclination and the speed of the projectile suitable equations for making these calculations can be found in the ballistics program ballistic v4 13 copyright 1988 1995 william r frenchu or in modern exterior ballistics the launch and flight dynamics of symmetric projectiles by robert l mccoy which are both incorporated herein by reference sensors such as strain sensors can be placed on the limbs of the bow or integrated into the bow string so that an indication can be made of the stored energy and used in calculating the resultant velocity of the projectile suitable strain sensors are described in united states patent application publication number 20070068270 which is incorporated herein.