Question

how i can calculate RB angles if i dont know where is laying but i know the vertical and WCB angles

however i do not have any graph

Answer 1

If you have whole circle bearing with their vertical direction then you obviously calculate the reduced bearing. First of all we have to draw vertical direction as North direction, from there we can have to plot whole circle bearing. If whole circle bearing is lesser than 180° then we have to reduce 180 from them, then we got reduced bearing. For example if WCB = 130° then reduced bearing = 180- 130= 50°, i.e, S50°E, similarly if WCB is greater than 180° then we have to reduce 180 ° from them to find RB. If WCB is greater than 270° then we to reduce 360° from them to deduct reduced bearing. For example if whole circle bearing= 300° , then Reduced bearing = 360- 300= 60°, i.e, N60° W.