If you want a GPS then Satmap is excellent - wouldn't be without mine. Plan routes on full OS and can also record routes when you go out with others. I find it teh easiest way as a newbie to plan a day out and can also leave full details behind on where I am going. Planning maps is easy.
Try Azcari online - you want bike version
Don't get the Bike version it does not have OS Mapping or the Li-Pol battery.
Get the Active 10 Plus and buy the bike mount seperately, will save you about £200
Bike version is Active 10 and comes with the mount for the bike/motor bike. Cost is about £320 with full OS 1:50K, LiPol, etc. Think also has voucher for 1:25K but that is too detailed for bike as run off screen too fast!!
Hope that helps