![Mad Mariner show](https://d3dthqtvwic6y7.cloudfront.net/podcast-covers/000/055/206/small/mad-mariner-blog-talk-radio-feed.jpg)
Summary: Mad Mariner's MadCast covers all aspects of boats and boating. In this edition, guest Mark Doyle, author of Get Onboard With E-Charting, explains how boaters can sort through, assess and purchase computer-based navigation software. With more than a dozen viable products on the market, ranging from free applications to those costing thousands of dollars, a few pointers can be valuable.