Hi there.
Iv'e been looking at exporting GPX files (routes) from the web app to iPhone and noticed that once imported a whole stack of waypoints are added. This goes both ways. For example a route with 3 way points becomes a rout with 30 or so waypoints. These added waypoints are useless and make the rout unusable. I emailed Navionics and got a reply along the lines of " I have passed this to our tech people to look at, in the meantime go our help section yadda, yadda. (which also is crap.) Anyway looked at a navionics promotional video on youtube - "How to Export and Import GPX Files with the Navionics Boating App"
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If you look at 11 seconds in you will see original route. At 1:16 you will see the imported route. - This shows the situation exactly. I made a comment below the video and was told that they know I have been in touch with them by email and follow up there. Yeah right. That was a week ago. Before I get back to these people (or is it a person) has anyone else had this issue?

Regards Neil