From reading the many posts on this topic, I think I may be in the market for a computer navigation system for my boat. I like the idea of seeing exactly where you are on a computer generated map and the ability of adding waypoints on the run. Now I would like to get the best value for the least cost. The following are my ideas and concerns: Software- it appears that many have and are satisfied with Capt'n-First Mate - $175? Is anyone using a less expensive program that they like? Computer - One can purchase a used laptop for about $200 to $600 (see usedlaptops.com)depending upon system size. What are the system requirements for Capt'n and what are the port requirement to interface with a GPS? GPS- I presently have a Garmin 12. Is this compatible with Capt'n? Other- Should I be thinking of some sort of mounting and covering for the computer to keep it dry? I think it's an interesting topic, and I would like to get your thoughts on this. Thanks and safe sailing, Bob