At last am very happy to complete all 20 challenges of Sankalp Project including extra challenges by BSG India. Try gone through following link for : https://youtu.be/9LtQ2J2CSEw [D ] Digital Scouting and Guiding. Challenge 3) Vedio Tutorial _ Mapping : Triangular Method of Finding Width of the river. explaining By Rover and Ranger of BSG District Association Udupi Karnataka State India.