Hiya Explorer 84
Congratulations on buying New Horizons
As Shipaddict has already explained, the ability to alter wave heights/sizes was removed in version 1.1, so it's no longer possible
Just a little side note for you:
If you have any technical questions at all, these must be posted in the Technical Support board. This is available here:
http://www.shipsim.com/ShipSimForum/index.php/board,5.0.html
* Please note: To access this area, you will need to register your licence key into your forum profile. If you're not sure how to do this, please check the General FAQ's or PM a Moderator.
Regards.
DJM.