Free - iOS
You knew it! Apple Books app is perfect to save French SHOM or US NOAA (OCS) digital publications on iPhone or iPad.
Some of these publications may now be downloaded for free in PDF format. You may now download 1D, 2A, 2B, 3C French guides, corresponding to the COLREG, or US Chart No.1, at anytime. You may also want to download some other usefull books like Sailing Directions, Lights and Marks, etc.