GPS for on & off road which displays OS maps

[GrumpyGregry]

good informative thread here about touring GPS. I need (ok want) a GPS for touring and for off-road MTB use (planning on tackling the trans-cambria in the autumn.) as I sick of wrnagling paper maps on long rides (but will carry them as back up)

My criteria are

must display OS maps (not negotiable)
splash/waterproof
handlebar mounting
decent battery life, up to 12 hours, preferable from replaceable rechargeable batteries
batteries must work at low temps (winter outdoor use)
back light for night use (a bonus)

I've seen a Satmap Active 10 deliver on most of these. But everyone says go Garmin. So what Garmin's can display OS maps?

 

[ufkacbln]

Basically the SatMap does all of the UK, whereas the Garmin Colorado etc simply do national parks at the moment

 

[GrumpyGregry]

SatMap it would have to be then. Flippin' pricey.

 

[stewlewis]

Road Angel Navigator 7000. With Memory Map installed. Off Ebay, around £80.
The Adventurer 700 is the same unit just with MM and some Maps pre installed.

Battery life is a downside, about 4 hours I think without and external pack.



Many Car Sat Navs can be hacked to Windows CE, installing other Sat Nav software and Memory Map or Ozi CE. Depends how tech savvy you are. But most aren't waterproof and battery life isn' great.