Let me add to what ITG stated:
Cursor: the distance to cursor from the side from the path that your boat took (90 degrees to the boat’s centerline). This number will not change until you move the cursor closer to or farther away from the centerline on the Si View.
Depth: water depth at the cursor position (this is a calculated value and is only displayed very close to the centerline, so it is blank most of the time).
Distance: the distance to the position the cursor is on. This will continue to change as you get farther away from or closer to the cursor position.
Bearing: the bearing from where you are now (which will change as the boat continues to move) to where the cursor is.