Personally I wouldn't wait for traffic updates; nor would I even want to trust them. I have heard "helicopter traffic" reports on the radio talking about an issue that has since been resolved, so I cannot see a GPS being able to get you info that is up to date enough to be of much help.
I used my GPS on my trip to Winnipeg for things like telling me where POIs (Points of Interest) were. For example, how far off the highway was the McDonalds in Moose Jaw. I've passed the signs dozens of times, but until I saw it was only 1km into town I had never stopped. Then on Thursday when I was going out to the cabin, I found a Canadian Tire location between where I was and where I was going.
The real beauty of a GPS is that it uses a signal that is paid for by somebody else (mostly US military) and gives you an interactive map. The only cost you have now is the one time fee for the software to give you the roads, POIs, etc. Once you add things like traffic reports, it could start the process of having monthly fees to cover that, or the level of service would have to be poor to be affordable for the GPS company.
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