I want to back up my chart plotter which uses Navionics (which, by the way, I have found surprisingly accurate). Most people I have talked to have an iPad (3G, GPS) and have the Navionics App which it is said works well. Clearly there are other devices on the market; i know Android also has a Navionics App.

Does anyone have knowledge enough to compare and contrast the two? Which should I buy?

I have the Navionics app on my android mobile but have never used the iPad/iPhone so I cannot compare the two. I love it.

Initially I had great difficulty downloading the Navionics app for the UK and Holland (which by the way is where the Ireland charts are) for my HTC even after having easily downloaded the Europe version before that. They have now fixed the problem. The apps cost about €25 each for European charts and less for US. I really didn 't want Europe but didn 't realize at the time that it did not include Ireland. The higher pricing in different regions is due to Admiralty royalties.

It works amazingly well even in our remote area on the west coast of Ireland. The community layer which is crowd source info must be fantastic for more populous areas.

Interestingly, I just went to the Google Play shop to see what was new and found that the apps I downloaded are no longer available. They seem to have been replaced with HD versions which cost €60+ and have terrible reviews.

Vice Commodore, OCC