Don’t worry about that. I don’t! The L1011 is so different from what we’re used to. As you probably know, the INS will give you distance and time to next waypoint. If you have a chart (I have Navigraph Charts on my iPad, which is also a neat cheat, since it displays your position) it’s not a bad practice to double check your position against nav aids off to the side. If your course takes you 20 miles to one side, then you had better be 20 miles DME from the selected nav aid at whatever radial you choose. I don’t know if the LROPS booklet is still available, but, if you can get a copy for download it has all sorts of procedures for Atlantic crossings—great for 757 or 767 too. I believe Captain Sim’s INS is 100% reliable, but if you aren’t comfortable with radio navigation you have more experiences to look forward to in this great airplane. If you’ve done the tutorial you’ll know what I mean.