On Wed, 07 Jan 2009 08:46:13 -0600, Geoff Schultz
wrote:

I'm not sure that it is safe to assume that large ships will always be
using an X Band radar if that is what you are driving at.

What are the radar requirements for ships up to 300 tons and over 300 tons?

Don't know the answer to that but for US registered ships the answer
can be found in CFR 46:

http://law.justia.com/us/cfr/title46/46cfrv1_02.html

Vessels registered elsewhere typically fall under the SOLAS
regulations:

http://tinyurl.com/ax2t6y