BUSSOLA dato falso 

PB=PV-(+/-d)-(+/- δ )

RB=RV-(+/-d)-(+/- δ )

RilB=RilV-(+/-d)-(+/-dev)  la δ   va presa sulla prora pPb o Pm

 

CARTA VERO

PV=PB+(+/- δ)+ (+/-d)

RV=RB+( +/-δ)+ (+/-d)

RilV=RilB+(+/- δ )+ (+/-d) la δ va presa sulla prora pPb o Pm

 

Pm= Pv-(+/-d)

 

RILEVAMENTO POLARE

RilV =Pv +/- RilP

 

SCARROCCIO E CORRENTE

Pb= Rv-(+/-der)-(+/-sc)-(+/-d)-(+/- δ )

Rv=Pb+(+/- δ )+(+/-d)+(+/-sc)+(+/-der)