Thank you for your question. I look forward to working with you to provide you the information you are seeking for educational purposes only.
First off, generally attorneys do not take these cases on a contingency. The attorneys generally want a minimum of $2000 retainer because of the need to cover their costs for filing any action and then from there they will take a percentage of any award you receive for the infringement.
You need to send the magazine, Yacht World, a DMCA
take down notice, which is a legal notice to remove infringing content from their site. If the brokers who are liable object to the removal you have to file a copyright infringement
suit against the broker who infringed on your copyright
Here is a sample DMCA notice: http://icaadocs.mfah.org/icaadocs/Portals/0/Copyright/SAMPLE%20DMCA%20TAKEDOWN%20NOTICE.pdf
If the brokers refuse to cease and want to object to your take down notice, your next step is I am afraid you have to get a local IP attorney and file suit against each of the brokers who are posting as part of their listing and seek damages from them.
Please do not forget to leave positive feedback by clicking on the 5 stars at the top of your page , as the experts are not employees of the site and get no credit for spending time with customers unless they leave positive feedback. Thank you.