The other navigation data being...? A map maybe, ok for a commercial flight they use charts but for mere mortals.., be interested to see were you got the data from though, I personally thought that carrying a map on board was a legal requirement in a "G" reg aircraft(private flight), please correct me if things have changed and you can now fly with a GPS only. I guess this relates to more IFR operated aircraft on a Cof A.
Cheers Will.