Where you're based is of significance: I somehow don't think you're UK based.
SD for example is not aimed at the US market and may also be variable in other european countries.
Beware also that SD/iPad can overheat in hot weather and just shut down: (Mine has, three times) so it's best to have backup nav in the form of a dedicated aviation GPS which, as a rule don't shut down in hot weather.
Don't get me wrong, SD is the D's Bs but I don't think OP should use it just yet...
Cusco.