Clearing up memory space?

Hi all,

I'm trying to free up some space on my Edge 540 and I seem to have several conflicting Map items but unsure what they all mean/which ones I can delete. I live in Northern Scotland so realistically only need Western EU and Trailforks. Does anyone know which ones I can delete?

  1. D9943010C.db (2.5 gb)

  2. D9494020A.img (3gb)

  3. D4713080A.img (2 gb)

Thank you!