This is not a dedicated bike sat nav but it is cheap and you will be able to mount it one way or the other. Ibood sell one product a day at discounted prices and when it's gone thats it until tommorows offer today is a MIO sat nav
You could keep an eye out for a Road Angel (7000?) as waterproof, well at least resistant and second hand units go for £50-£70 the local TRF load OS maps and green lay overlays so gives you multi options, The Ibood deal (above)looks good as well.
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