One of the arguments sometimes made against mobile phone-based GPS applications is that they'll chew up your data allowance, which can be a problem if your plan has a stingy allowance. But the issue could be more myth than reality.
At the recent Suna media briefing day where the traffic monitoring data developer discussed its Phase 2 plans, the issue of data consumption came up. The consensus from the Suna team was that in a typical day's use, a 3G-based GPS system pulling in maps and data might consume 100Kb in daily use.
That's not a tiny amount, but equally it's not likely to cause an issue unless you're on a seriously miserly plan or spend all your time on your mobile watching streaming video.
Have you experienced data shock after a GPS binge, or do you happily seek directions from your phone at any and all opportunities? Tell us your story in the comments.