单项选择题
Magnetic information on a chart may be （）.
A.found in the center(s) of the compass rose(s) B.indicated by isogonic lines C.found in a note on the chart D.All of the above
单项选择题 Entering from sea，a daymark on the port side of the channel would be indicated on a chart by a （）.
单项选择题 Distance along a track line is measured on a Mercator chart by using the （）.
单项选择题 Attention is （）the advice on the use of charts in The Mariner’s Handbook Chapter 3，Section 1.
