Wiktionary
navicert
n. A form of passport permitting a neutral ship to traverse a blockade in wartime.
Usage examples of "navicert".
The Turkish freighter that had been running refugees illegally from Corsica to Lisbon had lost its British navicert, and could not transit Gibraltar.
But we all knew that if our coded navicerts had not matched the patterns their five separate consulates at the departure port on Earth had filed, the next step would not have been an argument.