This is an example of traps for young flyboys. I had a 530 km flight across the east China Sea to the dormant volcanic island of Jeju. (In the previous post I said it was 510 kms. Google Earth and Microsoft Flight Sim differ in the distances. Therefore, I have to rely on MFS.)
I would be dead reckoning.
I'd worked out the heading and blithely flew off across the sea. Generally, over land, I would trim the plane and set the speed and wander off for lunch or the bathroom. I tried that with this trip but the plane would fall off the heading too much even though there was not much wind.
So I kept an eye on the instruments and settled back for a couple of hours of flying - surrounded by a blue sea and beautiful weather.
Then the mind starts to wander as I stare at the horizon looking for signs of land knowing there is nothing there. I started talk to myself and felt a bit like I had remembered Jimmy Stewart in "The Spirit Of St Louis" about Charles Lindbergh's non-stop flight across the Atlantic. He started to ponder a fly in the cabin and wondered whether it would add to the weight while flying around and so on. I started watching the movie again and he mentions dead reckoning!
Anyway, I got to the a point where I should start to see the island. I noticed a faint silhouette of an island right where I thought it would be and I was proudly heading straight towards it. At the same time I scanned the rest of the horizon and way off to the west there was the faintest hint of land. As it came a bit clearer it looked more volcanic than the one I was heading toward. I had a decision to make. Should I head to the other island or continue?
Or this one.......?
I decided to carry on and identify the first island from it's shape. It was a bit closer. I flew over it and it was clear I had the wrong island. So I turned to the west and headed to the other one. I had put in enough fuel but I had added about 40 kms to the flight. I couldn't believe I was that far off course.
It dawned on me that the compass on the instrument panel (that I was following) was wrong. The compass on the windscreen was obviously correct and would have delivered me close to the destination. That explains the misses I'd had earlier over shorter flights where the difference wasn't as critical.
As it turns out there is a dial on the instrument panel just below the compass which calibrates it to the other compass before take-off. Lesson learned.
That was the third life this Leo has used up. I've got plenty more.