if you can or better if you need to there's Garmin's new approach to NOAA's charts into electronic GPS. Nice !

Regarding the most excellent video on approaching Rabbit Key, Garmin/NOAA displays a snortsnortsnort tide channel route..

yeah I hear yawl...great finding it useing the dhow method....yo ! finding with the gPS method !

If there are seamounts and tides as at the San juans or endless sadnbars at lower tides as at Flrida bay then electronic rules for a not local pilote