One of the current problems with the NAV4 devices is that they can
only plot routes to a destination from "the" current location. You just may be a tad too far from California.
Now, me, being in the Greater Toronto Area have no problems planning a route to there.
Wasn't successful with Search > Whole map or the spelt out "One". It must be numerals here.
Changed to In town or city, entered "Rohnert" and then "1 double" and ended up with this screen.
You may get the same but it may say not on current map if the UK?Europe one is active for you.
No matter, all your planning is not lost as when clicking the Drive (steering wheel) icon this map appears (at least for me).
That "Destination" should be found when you go Menu > My Places > Recent destination. You can now turn this destination into a Favourite, to be accessible in My Places in alphabetical order (you can rename it).
This way you should be able to have the planned destination in My Places once you visit.