A professed sailing newbie with his first boat about to go in the water in a week asks how many use their cellphones for GPS navigation. I have the Samsung S3 and the lite version of "marine navigator". Having tested it while on other boats it appears to track things very well. I downloaded a bunch of appropriate NOAA charts and cold see everything I needed to see to get where I wanted to go. So is this something that is catching on in the sailing community or are we still advised to purchase stand alone GPS/plotter equipment. I am sure the phone software has limitations but it is tough to beat FREE. Plus the professional version is only like $6.