I'm new here myself.
I use 1:25,000 OS maps and also have them on my smart phone to use with Memory Map. I'm considering getting the Memory Map marine charts which cover the whole of the UK and are very good value IMO. I also use a satellite map downloader which sucks up satellite image tiles from Bing (better than Google maps), joins all the tiles together to make one large image, and then I calibrate then in Memory Map Navigator to make geo-refereced useable moving maps for Memory Map on the smart phone. Well worth doing as it gives you a true picture of the lay of the land.