If you have to buy one, buy a GPS. Keep in mind that anyone you buy would
require maps, so add the cost.
If you go with a tablet, I suggest, you better research the apps that are
available and figure out which one is good enough for you. I would not rely on
the tablet alone, they are obviously prone to failure in wet (and salty)
environment. A ziploc would go only so far.
Tablets have one major advantage – for the price you pay you get a huge
display.
If you have a tablet already, then the nav app is reasonably cheap (little
investment, little risk).
My experience is that land based maps are reasonably cheap; marine charts, not
so much.
You can use the free raster maps with certain apps, but you better know what
you are doing. I would practice ahead of the time.
Marek
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