Christopher Columbus did go to a special school for navagation, he got more and more in to it.
His tools for navagation was a magnetic compass,the log,the lead line,the quadrant or ustrolube, and dead reckoning.
HDF Explorer was created in 1998.
The Northwest Explorer was created in 1993.
Tango Explorer was created in 1990.
Viasat Explorer was created in 2002.
Usenet Explorer was created in 2005.
Ford Explorer was created in 1991.
AOL Explorer was created in 2005.
HTC Explorer was created in 2011.
Each an Explorer was created in 1956.
Leapster Explorer was created in 2010.