On the screen, you have a bar on the left side. Each car behind you will appear and get closer to the top of the apps and you can add sound to alert you. If a car goes too fast, the little car in the bar will turn red and flash. You always know if someone is behind you.
Thank you! So, your RWGPS with the smartphone effectively becomes the Varia radar display.
(I do not use Varia but my Wahoo would be the Varia display in my case. Or, Specialized Mastermind display works with Varia, too).
I like RideWithGPS a lot but had to subscribe to get all the features I want. Sorry, don't recall the details, but still a good value.
The RWGPS subscription allows me doing two principal things I need:
- On-the-fly route planning from the smartphone (then transferring the new route to Wahoo). (Wahoo can do ad hoc route planning for you but you have no control over the Wahoo suggested route).
- Advanced route planning features on the computer.
My cycling club activities involve a lot of work to prepare routes for the group. Say, I get a raw GPX from someone. First of all, typically such a GPX has no cues (RWGPS would Auto-Trace the route to provide the missing cues). There are numerous paid features to split the route, delete route segments, make several individual route parts, reversing the route and so on.
For instance, I could have test ridden a route I had created myself. The proposed route could lead me in a cul-de-sac or impassable segments (sand, deep mud, a creek, fallen trees). After I have done the pre-ride, my actually recorder trip track would be different from the planned one. Now, I work on that GPX to prepare the final route for the club. The paid features of RWGPS are invaluable!
A tentative gravel cycling group ride route plan (RWGPS) including the POI. It needs to be test ridden yet.
It is really good a GPX made with RWGPS can be uploaded to Nyon!