charging TomTom during ride - HOW?

[Gadge]

The TomTom I have has a battery life of 3 hours (max) so on a long ride it's not much use. Does anyone know of a 5V / 100mA dynamo that will charge this unit as you ride?

 

[Pingouin]

How about solar panels like that:
http://cgi.ebay.com/2pcs-0-275w-5-5v-50mA-New-mini-solar-panel-module_W0QQitemZ290133555431QQihZ019QQcategoryZ41981QQssPageNameZWDVWQQrdZ1QQcmdZViewItem

5.5V, 50mA each. Put them in parallel (not serial) and you get 100mA at 5.5V.