Letters / Is this name still known in Unst?

In his work on Shetland place names of 1901, Jakob Jakobsen gives a list of names of fishing grounds.

Among them is ‘Da Tussek’, somewhere in North Unst.

I would very much like to know if this name is still known in Unst, and, if so, where the place was.

Brian Smith,
Shetland Archives