You can use your IPad or IPhone as a standalone navigator with Blue charts. either works well for this, pay once, install on both.
I think they are a great back up Nav myself.
Don't forget Open CPN
either, I have it installed on a Panasonic Toughbook also.
If I get lost
, I don't have any excuses.
There is a free piece of Gamin software
that is good for planning and you can save to a chip and transfer to their plotters.
Forgotten the name, but it sounds like what your talking about
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