Broke My Navigation, How Do I Fix It?

[foobar]

I have a 2006 Lexus IS 250. I went into the secret service menu -> location -> and here I reset everything, the relevant one being the gain coefficient. This has affected the distance that the navigation system thinks I travel whenever I drive without being on GPS. It always is quite a bit short of the actual distance I go.

Is there a way to fix this? There doesn't seem to be a setting to change the gain coefficient back. I remember what the number used to be, so if I could change it, then I'd be fine... I tried calibrating everything, even setting the tire change button, but nothing has fixed it. I assume that I simply need to change the gain coefficient back, somehow...