RED Dots on Navionics Chart

[johnwater]

I have HDS Carbon with latest 20.291 update.
i notice on the lakes and waterways many small red dots interspersed all over the chart page,and not on sonar pages.
Any one have any idea what these are due to ,and how to remove them?
they dont affect anything, just are there, and maybe there is a setting on menu or somewhere to eliminate them?
thanks
johnIMG_4599.JPG

[yupitsme]

Yeah... you have set a value in the shallow water option. Red dots is Navionics ingenious method to mark that. Brilliant huh?