I have used MM now for about 5 years, I have the UK 25k set and just print off the area I need. I now want to put them on a device so have been looking into the options, I have an iphone but due to it not having a SD card slot I have decided to use a Samsung Galaxy G4 inherited from a daughter who is always updating. I have been testing it's GPS with GPSTest, a very useful app. The GPSTest shows you how quick your device takes to lock on and how many satellites it has found, the Samsung uses GPS & Glonass and locks on in about 30s to on average 10 satellites, it also has the advantage of the up to 32gb card slot for the maps. I will set it up this week and give it a test, if all works well the intention is to buy a S/H Galaxy Tab 3 7" just for navigation, this will save the battery on the phone and gives me a bigger screen so the glasses don't need to come out as often. I will report back after the tests.
"Rules are for the obedience of fools and the guidance of wise men"
Grp Cpt Sir Douglas Bader CBE,DSO,DFC,FRAeS.