Submitting your guide service or outfitter to directory websites is a good idea for two reasons:

First, because many of these sites come up in major search engines for a variety of phrases, which can lead potential clients to your website. Second, it can help build your search engine rankings by giving you high quality, relevant inbound links to your charter or guide website. Most are free, and some require you to link back to their site from yours (reciprocal linking), but all offer web links as well as contact info pointed towards your business.