Easy way to search is via the free on line Bing Maps
Www.bing.com Very easy to use but can't plan route.
Opens on road map, easy to find area you want to view.
Then swap to OS maps to get free OS mapping
Swap to sat image maps to "see" what's on the ground..
I've got Memory Map but no longer use it...
Much much better is ViewRanger...
Go to my.viewranger.com and sign up, it's FREE..
You can use free maps such as open cycle maps that show roads.
You can use OS mapping on the web site my.viewranger.com to plan and build a route that will show up on any of the free maps you choose so it's very user friendly.
You can download the route to almost any mobile phone that has a built in gps and use it on the lanes. I use an old iPhone 3GS that sits on a handle bar mounted waterproof case and is wired into the bikes battery.. Phone is well protected and as they are going for about £30 on eBay it's a very cheap way to start off before you spend 10x more on a bespoke mapping gps unit.
I got the case and charger from eBay for about £35..
If you want you can get the whole of the U.K. in OS maps on your phone for about £100..
You can also sync your route to your phone via wifi internet from the my viewranger page.
You can download whole areas of the free cycle maps as well.
If you then use wifi to access viewranger on your phone you can also download the maps directly.
You can ALSO then follow the route on your phone on the free open cycle map but switch to sat imaging.. Then that sat image of your route will stay in the phone memory for 90 days...FREE...
I did this for a trip to Crete this summer, planned routes at home via my viewranger, downloaded the free cycle map for the whole island, then viewed the route on the phone while connected to wifi broadband, swapped to sat imaging on line map via viewranger then had the whole route available off line in sat imagery.
I also had the viewranger 1:50,000 Crete map but didn't need it as the open cycle map was better.
I navigated several off road routes to remote areas using the phone and viewranger off line with phone data turned off.. Brilliant.
I found using the phone on the KTM as a gps mapping device using OS maps that I can switch to sat imagery very easy to use. It's very accurate.
I can also have normal road satnav working in the background and switch between ViewRanger and normal road satnav following the same route if needed.
The case for the phone is strong..I've covered more than 6,000 trail miles using the phone on the bars, dropped in mud, through brambles, dropped in snow, all day in the rain, dropped in a stream and never missed a beat...does not loose route if turned off, came simply clips on and off its mount, charger unit and cables are waterproof.
Although you can use MemoryMap in the same way I found it was more expensive and fiddly to use...
Only personal findings and many still like Memory Map.. Just nice to have an alternative view point...