I'm not afraid send me back to the Flight 19 Dead Reckoning and Pilotage. Obviously this is not very reliable unless you backit up with other navigational techniques. Unfortunately a lot of novice boaters and flyers, do just that. This is not only the dictionary definition, but it is also the way the term is used in aviation today.
Pilotage is the using known landmarks in an attempt to navigate.
This also is very dangerous unless other navigational tools are employed. Mainly because occasionally a suspect known land mark might not be correct. In the case of Lt Taylor, he mistook the Bahamas as the Florida Keys. Thus he started at the wrong landmark using pilotage, and then began to dead-reckon his way to Florida only to fly off in the Atlantic because of his initial mistake.