I think it may depend on what you are planning on doing. I don't know what you are sailing or where. The nicest thing IMO about a chartplotter is that it can usually be viewed from the cockpit without worrying about exposing a PC or iPad to the elements. Granted, a laptop or notebook PC can be had pretty cheap, particularly used so you may just look at that as a consumable item.
Do you want the chart plotter for planning, or for navigation while actually sailing?
S/V Legacy, Catalina 400 MkII, Hull #328
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