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Karsten said..
A few votes here for OpenCPN, and some for Navionics.
I understand that you get chart data included with Navionics and that is really what you pay for periodically.
But those using OpenCPN (and there are a few here), where do you get reasonably up-to-date Aus East coast chart data, and what does it cost once-off or periodically ?
Swings & Roundabouts...
Navionics is great portable and you don't need to find maps, or depending no external GPS ... just a Credit card.
Opencpn, free, mainly pc based, or android?? Mac, Linux (Raspberry), then you have to get a gps unless gadget has built in, then 'Find' free maps... unless you paid ?30 for 2 licenses for Oz. License can't transfer or be cloned, so if your hard drive crashes or new gadget.... new license.
But you can hook up to all sorts of stuff for information/data and good for planning. Can be made portable with wifi/Bluetooth etc...
Navionics -easy, reliable, fast, portable and enough for most punters
Opencpn- Needs some work, just not a app download. However is powerful with the right setup and a understanding that is a continual evolution freeware that can have its moments and can need basic computer know how.
Then there's all the super $$ Maxsea Alice type stuff that the commercial dudes can use.
Choose what suits your needs, be happy with it, and if it costs $30-50 a year..considering it's a fun gadget to have... if you have a boat, you'll be spending more than that on less useful fun stuff