An aerial vehicle, comprising: - a liquid chemical tank; - at least one spray unit; - a plurality of sensors; - a processing unit; and - an output unit, wherein, the liquid chemical tank is configured to hold a liquid chemical; wherein, the at least one spray unit is configured to spray the liquid chemical; wherein, at least one sensor of the plurality of sensors is configured to measure a speed of the aerial vehicle relative to the ground; wherein, at least one sensor of the plurality of sensors is configured to measure an air movement direction relative to the aerial vehicle with respect to a fore-aft axis of the aerial vehicle; wherein, at least one sensor of the plurality of sensors is configured to measure an air movement speed relative to the aerial vehicle; wherein, the processing unit is configured to determine an air movement direction relative to a projection of the fore-aft axis onto the ground and determine an air movement speed relative to the ground, the determination comprising utilisation of the speed of the aerial vehicle, the air movement direction relative to the aerial vehicle with respect to the fore-aft axis of the aerial vehicle and the air movement speed relative to the aerial vehicle; characterized in that the processing unit is configured to generate a spray record for an environment within which the aerial 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 at least one spray unit for the aerial vehicle operating within the environment over the time period, the determined air movement direction relative to the projection of the fore-aft axis onto the ground over the time period, and the determined air movement speed relative to the ground over the time period; and wherein, the output unit is configured to output the spray record. - a liquid chemical tank; - at least one spray unit; - a plurality of sensors; - a processing unit; and - an output unit, wherein, the liquid chemical tank is configured to hold a liquid chemical; wherein, the at least one spray unit is configured to spray the liquid chemical; wherein, at least one sensor of the plurality of sensors is configured to measure a speed of the aerial vehicle relative to the ground; wherein, at least one sensor of the plurality of sensors is configured to measure an air movement direction relative to the aerial vehicle with respect to a fore-aft axis of the aerial vehicle; wherein, at least one sensor of the plurality of sensors is configured to measure an air movement speed relative to the aerial vehicle; wherein, the processing unit is configured to determine an air movement direction relative to a projection of the fore-aft axis onto the ground and determine an air movement speed relative to the ground, the determination comprising utilisation of the speed of the aerial vehicle, the air movement direction relative to the aerial vehicle with respect to the fore-aft axis of the aerial vehicle and the air movement speed relative to the aerial vehicle; characterized in that the processing unit is configured to generate a spray record for an environment within which the aerial 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 at least one spray unit for the aerial vehicle operating within the environment over the time period, the determined air movement direction relative to the projection of the fore-aft axis onto the ground over the time period, and the determined air movement speed relative to the ground over the time period; and wherein, the output unit is configured to output the spray record. wherein, the liquid chemical tank is configured to hold a liquid chemical; wherein, the at least one spray unit is configured to spray the liquid chemical; wherein, at least one sensor of the plurality of sensors is configured to measure a speed of the aerial vehicle relative to the ground; wherein, at least one sensor of the plurality of sensors is configured to measure an air movement direction relative to the aerial vehicle with respect to a fore-aft axis of the aerial vehicle; wherein, at least one sensor of the plurality of sensors is configured to measure an air movement speed relative to the aerial vehicle; wherein, the processing unit is configured to determine an air movement direction relative to a projection of the fore-aft axis onto the ground and determine an air movement speed relative to the ground, the determination comprising utilisation of the speed of the aerial vehicle, the air movement direction relative to the aerial vehicle with respect to the fore-aft axis of the aerial vehicle and the air movement speed relative to the aerial vehicle; characterized in that the processing unit is configured to generate a spray record for an environment within which the aerial 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 at least one spray unit for the aerial vehicle operating within the environment over the time period, the determined air movement direction relative to the projection of the fore-aft axis onto the ground over the time period, and the determined air movement speed relative to the ground over the time period; and wherein, the output unit is configured to output the spray record.