Operation Manual

www.tissot.ch
147_EN
10/16
SAILING-TOUCH
*
Description of function
In weather mode, the hands are superimposed to
indicate the weather trend.
Explanations
Weather changes are related to variations in at-
mospheric 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 SAILING-
TOUCH 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 deteriora-
tion 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. Further-
more, the pressure variation caused by a rapid
change in altitude is detected by the watch and
compensated automatically so it only has a mini-
mal impact on the barometric trend. The SAILING-
TOUCH digital display indicates the relative at-
mospheric 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: 1 line = 1 hPa
zoom in: 1 line = 0.5 hPa
zoom out: 1 line = 1.5 hPa
Unit conversion: 1 hectoPascal [hPa] = 1 millibar [mb]
GLOSSARY > WEATHER