The present invention relates to a spray vehicle (10), comprising at least one boom (20), a plurality of spray units (30), a plurality of sensors (60), a processing unit (70), and an output unit (80). The plurality of spray units are attached to the at least one boom. The plurality of spray units are configured to spray a liquid chemical. At least one sensor (61) of the plurality of sensors is configured to measure a speed of the vehicle relative to the ground. At least one sensor (62) of the plurality of sensors is configured to measure an air movement direction relative to the vehicle. At least one sensor (63) of the plurality of sensors is configured to measure an air movement speed relative to the vehicle. The processing unit is configured to determine an air movement direction relative to the ground and determine an air movement speed relative to the ground, the determination comprising utilisation of the speed of the vehicle, the air movement direction relative to the vehicle and the air movement speed relative to the vehicle. The processing unit is configured to generate a spray record for an environment within which the vehicle is operating, the spray record comprising: information over a time period of at least one spray condition relating to one or more of the plurality of spray units for the vehicle operating within the environment over the time period； the determined air movement direction relative to the ground over the time period； and the determined air movement speed relative to the ground over the time period. The output unit is configured to output the spray record.
