![](https://static.youtibao.com/asksite/comm/h5/images/m_q_title.png)
[单选题]
已知过叠标时用磁罗经测得该叠标的罗方位为287°,从海图上量得该叠标的真方位为293°,Var=-1°,则该罗经的自差为()
A.+5°
B.+6°
C.-6°
D.+7°
![](https://static.youtibao.com/asksite/comm/h5/images/m_q_a.png)
D、+7°
![](https://static.youtibao.com/asksite/comm/h5/images/solist_ts.png)
A.+5°
B.+6°
C.-6°
D.+7°
D、+7°
方位换算公式为:
A.真方位=罗方位-罗经差
B.真方位=真航向-罗经差
C.真方位=罗方位+罗经差
D.真方位=罗方位+磁差
罗经差是______与______之间的夹角,以______为基准。
A.磁北/真北/磁北
B.磁北/真北/真北
C.罗北/真北/罗北
D.罗北/真北/真北