What is the difference between beeing uncertain of your position and being lost? Lets be clear about this, with attendant risk of this thread running to 30 pages, I would say: Being uncertain is when you know you are near your intended position, but you simply haven't confirmed this with the identification of features, it is virtually part and parcel of DR navigation! Being lost is accepting that you really have no confidence in your position and can probably only happen if you flew in the wrong direction than intended and you didn't time the leg (or found yourself in IMC, but that is another issue). In theory at least, if you timed the leg then, even if you flew anywhere between 30 and 60 deg out, you still know where abouts you are.