A Number Search Mystery Cache

The cache is not at the listed co-ordinates, but a quick number search will lead you to the correct location.

The container is a round clip-lock. It has an NFC tag if you have suitable phone.

Start your search from the highest number. Mark each sequence you find on the grid, each number is only used once.

When you have found all the numbers you should be left with 6 which are unused. Read these from top-left (a) to bottom-right (f).

N52° 48.abc E0° 30.def

You can check your answers for this puzzle on GeoChecker.com.