Zwift is far becoming awesome for a lot of people. Many of which are going all out and putting the game on large screens, however for the people that cannot have the luxury of riding with a big screen and only use a laptop or small 21-27" monitor, have a lot of trouble trying to see the map position.
For example, the map has 2 sections:
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The top shows the current gradient and section of the course, which i think equates to either 100-300m.
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The bottom is the map of the entire course layout.
My suggestion is to have the entire course layout or a longer section of road say about 1km placed at the bottom of the screen to show us in a larger scale what is coming up next cause its very hard to squint at the monitor if its a distance away, while on the bike.
Many people would argue that we should already know the course due to riding it a fair bit, however the newer people would not have a clue. I would also put forward that this would be a turn on/off feature (say press M) due to the fact there are a few racers and it could be a bit squashed in when seeing 25+ riders or so.
Keep up the good work, cant wait to see what is in store soon
Andrew