Um, lost yaw string? Cambridge-made GPSs are notoriously unreliable?

BJ

JJ Sinclair wrote:

Brion got most of the correct answers to the last NQD, so now a new one:

While heading for my selected turn point, I center the turn arrows on my
Cambridge GPS and notice that my bearing and track are the same, but my
sailplane is pointed a good 15 degrees left of the turn point. Why?
JJ Sinclair