The map contains exact locations of homocides from the 2000s to now. You can zoom in far enough to see the neighborhood the murder(s) happened in. I’m sorry that the site is primarily in Norwegian, but you should still be able to zoom around. Wonder of there’s a global map that’s that detailed.
Also, I guess it’s not that far fetched that 1 person was murdered on a boat some time during the last 24 years 🤷
I know of at least one case in Sweden or Danmark.
Edit: It was the murder of Kim Wall and officially it took place in Danmark.