Good idea!
Select: Sonar
Select: View
Select: Split
Select: Flasher
I also recommend turning on the voltage gage so you can see your battery level.
Push power button
Turn on Data Overlay
Select: Edit Overlay
Select: Add
Scroll to bottom and select: Other
Select: Supply Voltage
You can drag it around where you want it located on your screen and if you click on "configure" you can change the size of it.