Floyd, you're both right. If an IAF is designated, then it must be published. But if ATC gives you vectors onto final, then there is no requirement for you to fly over the IAF; as long as you're in radar contact and getting vectors onto final, you are relieved of the duty to cross an IAF and fly any procedure turns that may be depicted. Bfisk raises an interesting point however; approaches to major airports don't have IAFs published, because it's assumed that tower and approach operate 24/7/365, you will always be under radar contact and will always get vectors onto final whether you want them or not. But then what if you have a comm failure in IMC, while enroute to a major airport? Assuming you remain in IMC all the way, then you have no choice but to continue to the intended destination, and get yourself onto an approach any way can, depending on your navigational capabilities. ATC will shut down the entire airspace for you, since they won't know which approach to which runway you are planning. Therefore, I expect they want you to just get onto the ground ASAP, by any available means, without worrying about trivial details such as IAFs. If you have GPS, proceed direct the OM. If not, use the LOC DME to arc to the OM. Or pull out the enroute chart, find any navaid your A/C is capable of receiving and plot a rough course to the OM. Get on the ground asap and don't hit anything, and everything else is just paperwork.