Just as a confirmation of few facts, short interview (in polish) with another pilot who has flown this plane few days earlier landing at the same airport (Smolensk).
Trzy dni wcze?niej l?dowa? na tym samym lotnisku - Wideo - portal TVN24.pl - 15.04.2010 He says, that plane was fitted with EGPWS, mentiones that approach to Smolensk is based on two NDBs (he doesn't mention PAR/SAR, but on other hand it is not an in depth interview). Also says that it is very easy to switch avionics on board between metric and imperial units and that in the past they never had problems using correct ones.