Put away your protractor and think about what grid is - simply two sets of perpendicular parallel lines, one set of which points to Grid North, drawn on a piece of paper (the chart).

Any other straight line (your course) drawn on the paper will cut each of the parallel lines (of a set) at the same angle.

In other words, the grid direction of your course is the same all over the chart - so, in this case, it will be 177 degrees at both points in the question.