Hi Sandy, from one 'bilge rat' to another
This mod originally by Captain Cox has been around for so long the links to it appear to be out of date. It is used in TMO or can be downloaded from Jimimadrid's web page.
http://jimimadrid.kilu.de/SilentHunter/
Warning - annoying pop ups.
It's a compressed (zip) file, you'll need to extract it.
If you're using JSGME then extract to your Mods folder and enable it.
rgds, John