I like the 78 much better. The screen is brighter, it acquires satellites much faster, the road routing (my main use) is much faster with the newer cpu, the memory capacity is 20x more, and you can download satellite pictures and maps.
I do agree that the tide graph is a little harder to read, but that's not a big issue for me. I don't do much salt.
The 78sc model also has all the marine Blue Charts built right in. They are amazing, even though I don't use them much either. In addition to the blue charts, I can fit in both the road maps and topo maps for the entire eastern half of the USA and Canada.
The 76cx served me well for 8 years on the road, in the boat, and on the trail, but I find the 78sc much better with lots of improvements. With Energizer Ultimate lithium batteries, my 78 stayed on continuously (light off) for five days on an Adirondack trip last summer.
Rescue / Throw Bags
Touring Kayak Paddles
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