Since you are at 5.1.1 you can jailbreak and install a tweak to do it.
Think it was maps enhancer. I did that when I went to turkey, and it worked splendid, while on wifi, i sat down and panned around the area at different zoom levels, and the tweak prevents maps from deleting the catch unless you go and manually do it in settings. Then we just kept my iPad in my brother's, wife's purse when we were out and about.