tag:blogger.com,1999:blog-18283526.post4035705131414280631..comments2024-03-27T14:03:14.775+00:00Comments on Captain JP's log: SAC: Paper charts vs Raymarine chartplotter vs iNavX on iPad / iPhoneJPhttp://www.blogger.com/profile/09475536270807856327noreply@blogger.comBlogger2125tag:blogger.com,1999:blog-18283526.post-36102921455174434482012-07-16T10:29:34.973+00:002012-07-16T10:29:34.973+00:00Two top tips there, O'DockerTwo top tips there, O'DockerJPhttps://www.blogger.com/profile/09475536270807856327noreply@blogger.comtag:blogger.com,1999:blog-18283526.post-58720396159608555462012-07-16T05:38:25.959+00:002012-07-16T05:38:25.959+00:00Sometimes the best insurance with finicky chargers...Sometimes the best insurance with finicky chargers is to carry a low-power inverter and to plug the device charger you'd use ashore into that.<br /><br />But even a discharged iPad can be used to measure COG. Just tie it to a float with a line long enough to reach the bottom and toss it overboard. Take a bearing on the float as it recedes astern, and the reciprocal will be COG.<br><br>O Dockerhttps://www.blogger.com/profile/08674140306304705852noreply@blogger.com