I was using a Navionics+ mapping and did not check the base mapping to see if these graphics (red blotches) were also being displayed there. I have cleared my current track on our Helix 9 G2N SI but this red areas remained. A couple seem to be in an area around where we were on spotlock but the long rectangular area with the number 3 next to it we were not. Unfortunately, I live across the country from my family's unit and don't now have direct access to it.