Thanks again Mike. I recall plotting my evening stars after we'd sailed from Karachi bound around Cape Good Hope for the Med as Suez was closed. They were 30 miles out from my DR position, and I immediately compared the Gyro heading to the Magnetic heading, followed by an azimuth that verified minimal Gyro error. Then I proceeded to pore over my sight calculations endlessly trying to find where my error was. About this time, the Captain came to the chart room to inspect the ship's position and I related to him my problem. He took one quick look at my figures and quickly said, "you took your chronometer error the wrong way." He then proceeded to ream me up one side and down the other for my stupid error. I've always remembered the incident, as it taught me the importance of having a second set of eyes review important do***ents and figures. I'd studied those calculations for the better part of an hour and saw the same mistake the same way every time, but the second set of eyes saw the error immediately.