This is my first attempt at a mod, so please be gentle
I know a lot of people don't like the stock orange Underwater Marker so as a learning experience I decided to try and change it.
I have removed the outer circle of the marker and just left the small arrow and reduced the brightness of the orange a bit.
Weigh-Man
http://files.filefront.com/7362670
Download link updated
It works on V1.2 and is JSGME compatible...Enjoy