Tissot SAILING-TOUCH User Manual - Page 10

SAILING-TOUCH GLOSSARY > WEATHER Description of function In weather mode, the hands are superimposed to indicate the weather trend. Explanations Weather changes are related to variations in atmospheric pressure. When atmospheric pressure increases the sky clears. The area is then referred to as a "high pressure" area or "anticyclone" (A). When atmospheric pressure decreases the sky clouds over. The area is then referred to as a "low pressure" area or "depression" (D). The SAILINGTOUCH measures these pressure variations and indicates the weather trend with the hands, which can adopt the following 7 positions according to the weather developments: - 6': Big pressure drop, rapid deterioration - 4': Moderate pressure drop, probable deterioration - 2': Small pressure drop, probable slight deterioration 12 o'clock: No notable weather change + 2': Slight pressure rise, probable slight improvement + 4': Moderate pressure rise, probable improvement + 6': Big pressure rise, rapid improvement * Histogram mode provides more details as to the weather forecast. While the hands indicate the tendency to either sunny or rainy weather, the histogram shows the exact amplitude of these variations. Knowing when and how the weather will evolve is particularly important while sailing. For example, when the hands are on -6' and the histogram is indicating that during the last hour the pressure variation lost 3 hPa (= 3 lines less), it means that a rapid deterioration in weather is to be expected. The SAILING-TOUCH program takes into account the atmospheric pressure variation over the last 6 hours to calculate the trend to indicate. Furthermore, the pressure variation caused by a rapid change in altitude is detected by the watch and compensated automatically so it only has a minimal impact on the barometric trend. The SAILINGTOUCH digital display indicates the relative atmospheric pressure values in hectoPascals [hPa]. You can find relative pressure data on the website: www.findlocalweather.com Characteristics of function Measurement range: relative pressure: 950 hPa to 1100 hPa Resolution: 1 hPa Resolution histogram: no zoom: zoom in: zoom out: Unit conversion: 1 line = 1 hPa 1 line = 0.5 hPa 1 line = 1.5 hPa 1 hectoPascal [hPa] = 1 millibar [mb] www.tissot.ch 10/16 147_EN