S10/T10 Blazer 4WD V6-4.3L VIN W (1997)
Compass: Testing and Inspection
Operation on Winding Roads
When traveling down a winding roadway, the system may also exhibit a condition in which the direction of travel oscillates between two neighboring
directions (such as North and Northwest). This will occur if the road coordinates happen to be on the borderline of the two coordinates used for the two
different directions.