I normally use GT31 but I had a GW52 until it cooked (5 Hz) and same problem if a data point was lost.
I use GPSAR for datapoint info.
GPSAR normally shows the alpha run with error included. Post to GPSSS and alpha is zero.
Latest was an alpha shown at 20.3 kts with error. Actual clean best alpha was 18.09kts.
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