the satmap 10 morphed into the plus version - principally a price rise for very little and making you pay for the online route planning - which is clanky.
apart from a slow start-up time it is an excellent unit. however, these types of units are not particularly suited for "emergency" or "where am i" use as they are very expensive for the very limited functionality that is required of them.
i always left my gps unit switched on to download into digital mapping - which was really quite educational as you quickly learn that what is on the map isn't necessarily what is on the ground. routes weere uploaded into it.
i now use the satmap to follow my route as it shows an actual os map and it is perfect for this. however, if you like to go walkabout, which i do, the very small amount of map visible on the screen makes this quite difficult and i resort back to a paper map for the wider view.
so to summarise. i use the satmap instead of a map/compass (i always carry both as a backup) as to use it otherwise is a waste of a large sum of money and not what the unit is intended for.
whilst a nice, tempting gadget may seem what you want i don't think it is what you need although the final choice is always yours.
i would strongly suggest that you get yourself a gps unit, fairly basic like a geko 201 for example, and use it in conjunction with your map and compass to improve your map/compass work. i found that having a gps made my navigation improve very quickly as the gps gave me confidence in my decisions. it also allowed me to understand the nuances and foibles of both maps and gps units too - a very valuable lesson.
gps also have a trackback feature which means you can always follow your trail backwards should you decide you really don't want to go any further.
i would spend the extra money and get yourself some pooter digital mapping (i hate memory map with an extreme vengeance so i can't recommend any but they're all around the same price points depending upon how much mapping you buy - i use tracklogs because it doesn't use routes and tracks; it only becomes a route or a track when you load it into the gps) to play with and print your own maps, upload routes to and where you've been from the gps.
if i had gone straight to the satmap solution i would not have learnt so much as i have with digital mapping and a gps and i would be much poorer for it.