Steve, You may also want to consider the new free Garmin Bluechart Mobile app for iphone/ipad, $29 for all US costal. Also includes Active Captain data. Chas We cruise the BC and SE Alaska Coasts and I am exploring using an Ipad with Isailor (http://www.isailor.us/isailor/index.htm) as a back up to my "go to" nav system which runs Coastal Explorer on a lap top. Occasionally (as in dense fog and many rocks) the CE crashes. Not often