Did a ride today and drive the wrong road three times. Each of these times, it was because the visual turn instructions of the Edge 820 were misleading a bit. If it shows the white arrow for a double turn instruction (like left and a bit further right), it zooms in to show both turns. However, when the distance between the turns is very small, it zooms in quite a lot. In those cases, from the visual picture, it looks like the turns are far apart, leading to one making the first turn, and missing/riding past the second turn. I show three examples below with the OSM screenshots, where the double turns are very close together. In the first example, I also included a Street view image where it's very obvious that the turn is almost straight ahead in fact. Actually, for all three cases, a 'straight ahead' instruction would be interpreted correctly by everyone.
Possible solution:
I think the solution can be quite easy: put a maximum zoom level for the visual turn instructions. If the zoom in those typical cases, where both turns are very close together, is not that high, the visual instruction is much clearer and would indeed show that the two turns are very close. This would lead to many fewer mistakes by the user, and makes everything much more clear. Another advantage is that in that case, the blue position triangle is also visible again (if the map is zoomed in too much, you don't see the blue triangle coming to the intersection as it's still 'outside' the map view).
Examples:
Example 1. Location: (51.047048, 5.627588)
Example 2. Location: (51.060054, 5.647000)
Example 3. Location: (51.121240, 5.600444)
