Modifying Displays; Frequency Soft Key; Fig. 3-8 Frequency Soft Keys - Raymarine L750 Operating Handbook

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Speed
This is the speed of the boat through the water.
Log
This entry shows the distance traveled, determined by the speed
through the water. The L750 remembers this value after it is turned
off. You may reset the log by pressing the Soft Key for Menu and
using the Log Reset Soft Key.
Elapsed Time
This item shows the amount of time which has passed since the
unit was turned on. You may reset the time by pressing Menu and
using the Soft Key for Elapsed Time Reset.
Current Water Temperature
The display indicates the current water temperature.
Water Temperature Graph
One version of the display presents a graph showing the changes
in water temperature over the previous 100 minutes.

Modifying Displays

The Downlook and Window pages can be modified by using the Soft
Keys which appear across the bottom of the display area. These Soft
Keys control the Frequency, Zoom, Bottom Lock and A-Scope features.

Frequency Soft Key

We said that the Fishfinder uses sound waves to "see" through the water
under the boat. The "frequency" is a measure of how fast the sound
waves change or "vibrate." The Fishfinder uses sound waves with two
different frequencies – 50 kHz and 200 kHz. Raymarine uses these two
frequencies because each is better for a particular purpose. When you
press the Soft Key for Frequency, the unit presents four more Soft Keys.
See Fig. 3-8.
Fig. 3-8
L750 Fishfinder: Installation and Operation Handbook
Frequency Soft Keys