I got me a Mio C510E sat nav But it says "initially charge for 8hrs"...But there is only a charger via the cars cigarette lighter there is no in house charger, does this suggest you drive for 8hrs to charge it or am i missing a verse

Mio C510 UK & Ireland Pre loaded Specifications
GPS Performance
No of Channels 20 Channel
GPS SiRF Star III
Physical
Display 3.5" TFT, 65000 colours
RAM 64MB SDRAM
ROM 512MB flash disk
USB 1.1
Bluetooth 2.0
Echo cancellation Yes
Dimensions 110 x 70 x 20 mm
Weight 190g
Battery 4 hours
CPU Samsung 2440 - 400Mhz
SD/MMC Slot Yes
TMC Optional
Microphone Yes
MP3 Player Yes
Photo Viewer Yes
Speaker 1.5W
Standard Accessories
Software MioMap V3 Maps of Europe on DVD
User Guide Pages & Pages of essential information
Car Charger In-car cigarette lighter charger
PC connection USB interface Cable
Mount Windscreen suction mount
Operating System / Software
Operating System Windows CE
Software MioMap V3 Full Europe with UK & Ireland + MRE preloaded

If you got all that with it Tony, you should be able to charge it via the USB and PC.

Then again Tom Tom has an in house charger as well as USB and car charger

So if i leave an umbilical USB to the nav for sometime we have lift-off... Am i correct

Yep