Let me quote uncle Dick
Despite these, I always carry a battery operated Garmin 296 GPS – I have one in the glove box in each aircraft. This means that if everything else fails, I have navigation information and also quite acceptable attitude, climb and descent information as well as ground speed. The units operate from dry cells and will keep going for many hours.
Now I'm not a rocket scientist or an English teacher but...........
Mr Smith says "despite these ( referring to the stuff above ) if
all else fails.........I have quite acceptable ATTITUDE information ...........blah blah blah"
WRONG