Hey everyone, I was looking into RobA's brilliant tutorial on making maps in Gimp, but I have gotten stuck when making the water. When I use the Gradient Map feature the land becomes green when it should become blue.
Green.PNG

Here are my foreground and background colors:

toolbox.PNG

and here is my other dock if you're curious:

Dock.PNG.

The map before the gradient:

Normal.PNG

Any help will be appreciated.
Thanks!