Wahoo's last firmware release was suppose to address the poor visual TBT navigation popup screen issue. I haven't had the chance to try it since the update but I'll get a chance to try it this coming Saturday on a charity ride I'm doing. Will post and let you know how it turns out.
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HCFR Cycling Team
Ride Safe ... Ride Hard ... Ride Daily
2017 Colnago C-RS
2012 Colnago Ace
2010 Giant Cypress