GPS address search in Canada

I have a 2012 Prius v (lowercase v for the Prius v wagon) that I bought in the U.S. Although I'm not particularly fond of the built-in GPS, it was at least usable in the U.S. for the last several years. Since relocating to Canada, I can't enter any address as a destination without specifying the first 3 characters of the postal code. In other words, the city and province are not enough. And if you choose the wrong postal code, then your street name search won't find what you're looking for.

Canadian users - am I missing some here? Or is this just how it works?

 

Yes, it's the 6.1" GPS.

So that's the way it worked for the last 4 years in the U.S. Here in Canada, I enter the country, then the province. Next I enter the city using the type-and-search interface. After typing "LON" (I live in London.) if offers me two selections one of which is "London, N6A". After accepting "London, N6A" as my city, I attempt to enter the street (e.g. "Sunningdale"); but it's not found because Sunningdale Rd. doesn't pass through N6A. Instead I have to lookup the postal code for the destination (N6X) and override the N6A that the city search pre-populated for me. If I could figure out how to clear the postal code field, I would. If a postal code is specified, it restricts the street name search to that area. But the problem is that the city search fills it out for you after which you seemingly can't clear it. You can only change it to something else.