On April 15th, 718 Cyclery hosted a class on how to use GPS-type devices.
The class gathered as Joe showed the process that 718 uses to create, share and utilize various GPS file data
Garmin Varia Radar Lights
I had my first commute with the Garmin Varia lighting system this evening. When paired with a Garmin GPS device (in my case, and Edge 1000 Explore), the headlight dims or brightens based on speed and/or time of day. and the rear (radar enabled) light lets you know if cars (or other cyclists) are approaching from behind.