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Extra £100 as opposed to which model? It was my first Wahoo, used it for a good while, I think it's good enough, provides zoom levels. But if you get lost you need to find the way back (or connect to the route upstream) yourself. But zoom (zoom out this time) still works (can't pan...) you can kind of work out which direction you need to go. Screen updates faster compared to bigger screen Wahoo models (due to all of them being e-ink, small is faster) so overall the unit feels snappier too. And the buttons feel much nicer compared to the bigger models. (I have experience with all three, switched to a mate's older ELEMNT when the Roam order got delayed and I had already sold my Bolt)
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Just how bad is the BOLT for mapping/navigation?
Depends where you're riding. Open countryside with only a few roads and junctions? No problemo. In town, with tightly-packed streets and roadwork-induced mandatory detours? Total PITA. As with all things, the correct answer is 'it depends'. OK, most things.
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It's... fine? I've had one for years and use it for everything, including week long tours. If you plan routes in advance I can't see why the minimal way it presents a route would be an issue for you. I very rarely take a wrong turning while using it, and if I'm coming into an urban area with lots of roads I just zoom in as much as possible - it works for me.
Just how bad is the BOLT for mapping/navigation? The internet is filled with opposing views on whether it's good enough: on the one hand - the screen is too small and there are no street names/the chevrons are crap; on the other hand - navigation is fine as long as you don't want anything too technical, you can use your phone if need be.
Is it worth the extra £100?