P.S. to #116,
Drawing the harid took about an hour and any lack of precision would show up.
On the outbound part of the let down one tried to assess the drift, perhaps 10 degrees Port, which would be something like 10 degrees Starboard on the final approach. (" Try and remember !")
The Magnetic Compass would have shown acceleration errors, as would the ball or slip needle ( these may well have been artificially induced). Flying by the seat of one's pants was NOT the right thing to do.
By chance I went to the French National Gliding Centre, where landing along the wide top of a ridge, which usually had a cross wind ( useful for ridge soaring for endurance flights) The cross wind for landing must have been more than half one's landing airspeed, landing on the one wheel or skid and hoping to lower the into wind wing in the last moments of the landing run. ( The instruction was in Franglais, both learning !)
Some of the landings were up the slope and with the usual ( now) tail wind, aiming to stop close to the top for a turn around for a further flight. Interesting, Not airline!