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I disagree -
First of all - I've owned gps units (on sailboats) and a GPS / FF (garmin 188) for years. I've never had a gps unit go down. So reliability is a non issue. Plus I keep a handheld unit as backup anyway in case I need GPS and my unit goes down.
Second - I find having a split screen of FF / Plotter absolutely invaluable. There's nothing like zooming in on your plotter as you approach a piece of structure and seeing it simultaneously appear on your FF. It may not sound like much - but having to move your eyes between two different screens at different resolutions is distracting (a friend has separate setups on his grady and I find his setup distracting).
Just my 2 cents - but I'd say go with the combo unit.
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