Furuno TS-331A - Manual (Page 39)

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4. DEPTH/TEMPERATURE DISPLAY
The depth and water temperature display graphs depth and water temperature,
from right to left across the screen. This display uses a 3-second interrogation
timer to determine when to ask the underwater unit for information. When this
timer expires, the current interrogation is completed and the next two
interrogations will be for the temperature and depth. Thus, the number of
minutes of data shown depends on many factors including operating range, and
which sensors are active when the timer expires.
Temperature
(yellow)
Depth
(white)
Temperature Depth
*
Unit of temperature
measurement Unit of depth
measurement
Temperature
scale Depth
scale
Depth/Temperature display
4.1 Unit of Temperature, Depth Measurement
You may choose the unit of temperature measurement from Fahrenheit or
Celsius and unit of depth measurement among meters, feet or fathoms. This can
be done with Units-Temp and Units-Depth/Range on the Options menu.