I was a little surprised when I saw it's a row-boat!
The majority of Jews were ferried across to Sweden in small fishing boats, like this:
https://images.lauritz.com/images/14D1A4F4C0D3470B157E6CAFDC9D98B4
There were thousands of family-boats like this all over DK back in 1943, so it was possible to blend in with the general traffic and slip across to Sweden under the cover of darkness.
But this harbor is located about 10 Km from the Swedish coast, so I guess some Jews were simply rowed across. Or at least rowed out to see, before the outboard engine was turned on.
I get sentimental when I see and hear a small fishing boat, usually light blue, and the distinct tuk-tuk sound of the two-tact engine. Reminds me of the boats in the harbor of the small town I grew up in.
Fortunately the vast majority of Jews in DK lived in or around Copenhagen, making it easier to hide them and also smuggle them across to Sweden.
It was considerably more tricky for Jews living in other parts of DK.
It was very difficult to hide them. If someone learned that Jensen was probably hiding Jews in the attic. The whole fishing village would know within 24 hours!
And the geographical distance also made it more difficult to smuggle Jews to Sweden. All fishing boats had and still has an ID number that clearly says what fishing town the boat is registered in. And back in 1943 a small fishing boat from Jutland might attract attention if it was seen heading east towards Sweden.
Yet, only a few hundred out of some 8.000 Jews were taken.