> Is it possible to turn OFF the led of the Wireless Transmitter, so the trasnsmitter does not blink during the dive?

Is it possible to turn OFF the led of the Wireless Transmitter, so the trasnsmitter does not blink during the dive?

Yes, is possible to deactivate the LED on the transmitter using the Ratio ToolBox.
Just connect the Wireless Transmitter to the Ratio TooBox and select the proprer option on the tab.

Here the link to download the Ratio ToolBox:
https://www.ratio-computers.com/support/support4/support_toolbox_main.htm