Did my full IR in a duchess with a Garmin 430 fitted, but only one of my three instructors showed me anything about it (although I had read the manual) and the general advice I had was not to use it at all for the test.
I then pass said test, but in the debrief the examiner asks why I didn't use any of the GPS functions, as it would of helped situational awareness, and he would have "detuned" anything that I wasn't allowed to use at the appropriate parts of the test.
Same with the autopilot, he was baffled why noone was teaching IR students to use it.