Multiple choice Track = 151, Variation = 17 degrees east. Magnetic course = 187 159 134 145 Reveal answer Fill a bubble to check yourself C Correct answer Explanation When variation is east, subtract it from true course to get magnetic course. Track 151 - Variation 17° east = Magnetic course 134. East variation requires subtracting. 187 would be adding, 159 ignores variation, 145 is incorrect arithmetic.