What I would do now. Is copy and paste the map info from the os map card into a folder on your desk top and then copy it across to a new blank 4gb sd card which you leave in your pc. The copied info will work in base camp but not on a device (as it's lock protected) but it Saves you plugging in the device every time you want to look at the os maps in basecamp or having to remove the card and putting it in your pc. Make sure you COPY it do not Cut or delete it! Strange but basecamp will only read the data from an sd card you/ or I can't seem to get it to see the deck top file with it in only the sd card.
Have a flick through the tutorials on YouTube and start by creating some folders and list files.
I'd suggest one file for every county and one for planning and one for recording what you rode when you get back.
The key to remember is you can move data from folder to folder and it will be visible in all folders. So If you have all your green lanes for say Wiltshire in its own folder you can temporarily send all them to the planning folder to do a route, then remove them and they'll still be in the wilts folder, likewise when you're done you can send the planned route to another folder to record it and then remove it from the planning folder to keep that empty for next time.
If you remove daya from a folder then it won't be deleted it will be in its original location or if there isn't one it will be in the unlisted data folder. This is of course Unless you actually delete it, then it will be lost.
Back up basecamp periodically as it does hang sometimes on my laptop using windows 10 if I've been doing a lot of plotting. But it is an old lappy.
Plan your rides as tracks as routes are a bit cluttered for my liking and sometimes will keep sending you back to a road in a zig zag fashion.
https://youtu.be/kDyh1AsndVwSent from my iPhone using Tapatalk