Prepare the ride before it begins.

The source accepts temperatures from sixteen through thirty Celsius. Twenty one is five above the lower bound and nine below the upper bound. This common axis uses fifty pixels per degree. The source rejects fifteen and thirty one. This is a local entered preference, not a measured cabin temperature or a vehicle command. Four fields are temperature, vent, destination and note. A valid temperature and nonempty trimmed destination are required. Blank note becomes No trip note added. Equal boxes count four stored fields, not vehicle systems. Preview saves one local record and shows its entered values. No vehicle is connected. Preview twenty one Celsius, then type twenty four without previewing again. Download still describes saved twenty one. These bars share twenty pixels per degree, so three degrees makes sixty pixels difference. A new valid preview saves twenty four. Reset clears the record and reloads. There is no ride booking, vehicle control, availability check or verified current operation.