diff --git a/styles/color_palettes/basemap_blue_sea.txt b/styles/color_palettes/basemap_blue_sea.txt
index c554646fc9453b44393d66764f1ce3bf8ca341c0..cd72e28156f65fc9d197bf7949eb9b57f0d862ae 100644
--- a/styles/color_palettes/basemap_blue_sea.txt
+++ b/styles/color_palettes/basemap_blue_sea.txt
@@ -5,3 +5,7 @@ nv 0 0 0 255
 -50 232 250 255 255
 10 240 250 255 255
 100 240 250 255 255
+1000 179 179 179 255
+10000 153 153 153 255
+20000 250 250 250 255
+30000 255 255 255 255
diff --git a/styles/color_palettes/basemap_grey_sea.txt b/styles/color_palettes/basemap_grey_sea.txt
index d8770d85f0f8ed51956b35bdf016de07a065e0da..00095bc5e1ad770b37d0693c3070aa639a9afb7d 100644
--- a/styles/color_palettes/basemap_grey_sea.txt
+++ b/styles/color_palettes/basemap_grey_sea.txt
@@ -5,4 +5,8 @@ nv 0 0 0 255
 -50 242 252 255 255
 10 245 252 255 255
 100 245 252 255 255
+1000 179 179 179 255
+10000 153 153 153 255
+20000 250 250 250 255
+30000 255 255 255 255
 
diff --git a/styles/color_palettes/basemap_greyblue_sea.txt b/styles/color_palettes/basemap_greyblue_sea.txt
index 6eef0ec10c513bd26772270e195452d4a0f559f2..fd3aba8d79152141126e484addfe1b9e57782a41 100644
--- a/styles/color_palettes/basemap_greyblue_sea.txt
+++ b/styles/color_palettes/basemap_greyblue_sea.txt
@@ -5,3 +5,7 @@ nv 0 0 0 255
 -50 242 252 255 255
 10 245 252 255 255
 100 245 252 255 255
+1000 179 179 179 255
+10000 153 153 153 255
+20000 250 250 250 255
+30000 255 255 255 255