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Wind correction angle is the crab angle needed to hold a track: arcsin of the crosswind component divided by true airspeed. For small angles the handy approximation is WCA in degrees equals 60 x crosswind / TAS, which is why a crosswind of one tenth of TAS needs about 6 degrees of crab.
Wind correction angle
WCA = asin(crosswind / TAS); GS = TAS x cos(WCA) - headwind
Aviation results are planning estimates only. Always verify take-off, landing, fuel, weight and balance figures against the certified Aircraft Flight Manual, current performance charts and applicable aviation regulations before flight.
WCA is roughly 60 x crosswind / TAS degrees. It is accurate to within a degree for crosswinds under about a third of TAS.
Slightly. Crabbing means only TAS x cos(WCA) is directed along the course, so a large crab angle trims a little from ground speed.