When using the radar for navigating().
A.
the best fix is obtained by using a tangent bearing and a range
B.
and using two radar ranges for a fix,the objects of the ranges should be close to reciprocal bearings
C.
and using ranges,the most rapidly changing range should be measured last
D.
and crossing a radar range of one object with the visual bearing of a second object,the two objects should be 80°to 110°apart