Navigo/F&H N30 and tomtom time one hour out - registry hack?

[funtime26]

Seem to remember a registry hack (on the old pctailor site) to correct the time on tomtom...in fact I did it on navigo V1 and it worked but can't remember how to do it and now want to do the same on my F&H N30.
Any ideas?
Thanks in advance! :respect-001: