1-50. If the detachment is fully trained, they can successfully execute the three methods of waterborne infiltration. Personnel must be able to calculate the time required to transit from release/launch/transfer point to the BLS for all types of infiltration methods. Figure 1-3 shows the nominal planning ranges. The time required can be calculated using the D = ST formula, where D equals the distance in nautical miles, S equals the speed in knots (kn), and T equals the time in hours.