4 8 15 162 3 42
If one searches the numbers (4 8 15 16 23 42) in coordinates: 4 8 15 162 3 42 in Google Maps, the result is located in the Pacific Ocean near the Marshall Islands.
Once we try a closer look with the satellite mode on, we can see a little island near the spot.
This is a zoom on the small island which is close to the coordinates at 5°19'02.35" N, 162°57'34.61" E
A zoom in on the runway on the island shows the number 23.
This island is called Kosrae and it is part of the Federated States of Micronesia.
Interestingly, the pirate Bully Hayes shipwrecked The Leonora on the above shown island on March 15, 1874, near the time that The Black Rock shipwrecked on The Island in 1867.
4 8 15 16 23 42 - The coordinates in Google Maps
Kosrae in Wikipedia - Information about the island near the coordinates