Not often. Most of my rides take place on roads I know very well - the only useful thing then are the ETAs etc. The graphics on an iPhone using Google Maps is far superior to my Tom Tom Rider 400, especially with the current set up where the Sat Nav is mounted on the handlebars and isn't "heads up" - there is a lack of aftermarket accessories for the Guzzi at the moment, as soon as a mount is available that places the screen above the TFT dashboard - it should be OK (no need for my aging eyes to have to re-focus between speedo and the Sat Nav screen.
On a different note - I dodged a bullet from a camera van the other day, I was using a rat-run to get home to avoid holiday traffic, came out of a roundabout under acceleration, and noticed a camera van, I had 34 mph on the speedo as I throttled off. After the run to Oxford with GPS in place found that my bike's speedo is reading 10% fast, oddly the odometer is more or less spot on.
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