recalibrating axis speedo

Has anyone had to recalibrate their Axis speedometer? Im dealing with one that is currently about 5 mph under where it should be based on wake characteristics. A little step by step help would be sweet if anyone has done this before.

thanks

toggle through info screen to "lake temp"

get up to riding speed, 24, 25 on gps

press and hold the DOWN arrow for 3 seconds and the display will start blinking.

Use the up and down arrows to adjust your digital speed (on right guage) to match gps. I forget what button to push when done, I think it just times out after a few seconds if you do not touch anything.

Test it at faster speeds and again at slow surf speeds.