having just looked at the source 'code' for the homepage, there isn't any references to any third party sites except youtube.
Is it possible to embed nasties in a video?
Other than that the only references are on vsteps server. I can't see anything to get upset about. That said, this is my opinion only and not defacto.
Thank you for doing that Stuart, except something I might add:
VSTEP Shipsim(dot)com uses PHP, which, is NOT visible when looking at the source code. For example, this script, written in PHP:
<?php
echo "Hello everyone who reads this"
?>
When you look at the source code, will only appear as:
Hello everyone who reads this
Which is the same with almost all PHP tags. For all we know, there is much in there we don't know about.