Dylan Smith wrote:

In article , Peter Duniho wrote:

How so? Dead-reckoning is not nearly as reliable as pilotage. It's
basically a "poor man's intertial navigation system". With pilotage, you
know exactly where you are. All dead-reckoning does is give you a rough
guess as to where you think you might be.


Dead reckoning is an incredibly important complement to pilotage, and
it's how my in-built (i.e. in-brain) "GPS" gets much better accuracy.
Keep track of time since the last major waypoint or landmark, and it
stops you mis-identifying one ground feature for another, or one airport
for another. It forms a very important cross check when I'm doing
radioless navigation.


Why do you need dead/ded reckoning when you can see the ground?


Matt