I have a SATMAP and it is really good (no I am not employed by them) but if you are thinking of getting one see below.
SATMAP have an offer on:-
Limited offer, while stocks last – the Active 10 PLUS (SRP £387.99) has now been bundled to include Ordnance Survey GB Whole at 1:50,000 scale. A superb offer on our award-winning GPS. The GB Whole map card, which normally retails at £203.99, gives complete Great Britain coverage on the one SD card
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Pennine Way 2005&2014; C2C 2006; SWCP 2007; WHW 2008; GGW 2008; Dales Way 2011; Clev.W 2012; Yorkshire W.W. 2012; Offa's Dyke 2013; Peddars Way & Norfolk Coast Path 2014; Pembrokeshire Coast Path 2015: LEJoG in stages 2018: Camino 5/2019.