You are on reference line of fairway.

你船在航道参照线上。

Your track is converging to reference line.

你船的航迹正与参照线相交一点。

Your track is diverging from reference line.

你船的航迹和参照线不平行。

Your track is paralleled with reference line.

你船的航迹和参照线平行。

You are approaching reference line of fairway.

你船正接近航道的参照线。