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My Varia RTL510 or RTL515 Is Not Detecting Vehicles Properly
IMPORTANT: If the radar operation stops working, Garmin® recommends that you stop riding and check the devices in a safe location.
Make sure the device is mounted such that there is nothing obstructing its rearward view. This includes the rear tire, saddle bags, luggage, etc.
The unit should be mounted to the seat post with the supplied mount and that the unit is close to vertical. The unit should typically not be mounted flush with the seat post.
Ensure that the LED is pointing directly behind the bicycle. Radar performance will deteriorate if the unit mounting is skewed.