How do I synchronize my Garmin with my PowerTap hub?

Under SETTINGS > PROFILES & ZONES > BIKE PROFILE > Be sure the check box is made near the word POWER. Also, use CUSTOM for the wheelsize and not AUTO. The custom wheelsize setting will tell the Garmin to use the PowerTap hub's signal for speed rather than GPS signal. This will guarantee that speed signal is maintained while riding on a stationary trainer or in areas where GPS signal is weak.

Under SETTINGS > ANT+SPORT >ACCESSORIES Be sure to set "Power Meter Present?" to YES then press the Restart Scan button. You will notice that the screen changes back to the ANT+SPORT main menu and nothing else appears to happen. This is normal, and the Garmin should find the PowerTap hub at this point.

The Garmin should also indicate "Power Meter Detected" in any of the display windows after exiting the setup mode. You will also see a white and red icon near the Heart Rate icon on the top of the display when you press the menu button.