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@TheBrick(Tommy)
Yep both navigators. The vista has a built in altimeter, the legend just uses gps to find height so less accurate and £20 less. They are both navigators, like the 705 and 605 come with a base maps but you need to buy or "acquire" maps to use them fully. You can plan routes at home on a computer or be out and say I want to get to xxx and I am a bike / car / walker.
HCX is the model type. I am not sure what the H means, I think it might be to do with the chip set type high accuracy, C means colour screen and X mean expandable, i.e you can plug in sd card to expand the memory.
The only difference with I can find with the 605 / 705 is the heart rate / power meter / cadence e.t.c Which to me has no interest but if you're interested in that extra information then I guess it's worth the extra money. I have not bought one but after my research either the legend or vista would be one of the ones I would buy.