The Greek tanker Sola TS had urged a Norwegian frigate to turn ahead of a serious collision last Thursday off Hjeltefjorden.
The Helge Ingstad was warned four times about the impending clash, according to a recording of communications cited by the Verdens Gang daily.
The 113,000-dwt Tsakos Energy Navigation aframax (built 2017) told the ship to move to starboard, the report said.
The collision led to the warship taking on water and being grounded to avoid sinking.
Eight people on the frigate suffered minor injuries.
The captain of the tanker called the Fedje vessel traffic centre three minutes before the crash to ask which ship was heading their way.
After being called by the tanker, the response from Helge Ingstad was: "Then we will come too close to the blocks."
But it is not clear what was meant by this.
Another call records a tanker officer as saying: "Helge Ingstad, you need to do something, you're getting very close.
"Helge Ingstad! Turn! We are going to collide."
The Norwegian military has not commented.
