Red + on radar display?

[Bayhouse]

This red + appeared a few times today, no target in that area and I don't recall seeing it before or could find anything in the manual
. Usually disappears after a brief time, but at least once it remained for quite a while

 

[FishTech]

Do you have a remote control or a mouse of any sort attached?

 

[Bayhouse]

Do you have a remote control or a mouse of any sort attached?

No remote or mouse of any sort.

 

[Johnny Electron]

No CSH10 sonar or anything that accounts for a cursor? Because that is what it is. It is a cursor for something.