Hi Bucky Allen
With the Navionics Marine App for your iPhone -
You can plan your on-the-water adventures anytime and anywhere....check tides, set your routes and markers, and search marinas. While on the water track your navigation, capture geotagged pictures, and create a virtual travelogue of your entire trip that you can share with your friends and family on Facebook. For those friends not yet on Facebook, simply email them your adventure log and let them view it overlaid on Google Earth and Google Maps.
Please visit our website www.navionics.com
select Mobile and then select Mobile Marine from there you can select FAQs (frequently asked questions), obtain a users guide and link to YouTube to see some videos. I would also recommend you become a Navionics Facebook and Twitter fan, I think this will be very helpful in getting you started. On the App itself you can select settings and then select Help for additional app support.
Have fun and happy boating!