I’m beginning toward my instrument rating. I passed the written a while ago and done a little under the hood time, so I’m pretty far off from the actual check ride. However I’ve got a couple of questions that I’m hoping someone can help me with. On the oral part of the exam what constitutes a failure? I mean if I forget one item related to mandatory reporting do I fail? What is the criteria for failure? Also since I don’t have RNAV in my aircraft do I have to know all the nitty-gritty details of our NAV information? This really started to come to mind as I was studying the ACS and came upon RNAV system annunciations and what they mean. I was asking myself do I need to know this stuff since I don’t have RNAV and currently can’t afford RNAV. I understand that they can only test you against the equipment that is in your aircraft, but can they quiz you on it during the oral quiz? Yes it means that I’m currently lazy to endeavor to study this at this time. I’m just the type of person who doesn’t really start studying things until I really need to know them.