Tony regarding tank bag I bought a new one on e-bay for £45. IT fits perfectly and is great for all those little bits that we seem to carry.
Regarding sat nav just below the speedo & rev counter there is a spare terminal hanging on a separate line that all you have to do is slip the power line into and your sat nav has permananet power, controlled by the ignition.It is also easy to disconnect. You can get a connector from Nippy normans or one of the breaker companies for a couple of quid. Hope this is helpful.