This indicates a low battery level. Please place your HDGPS receiver on the charger for an extended period of time (min of a few hours).
If your HDGPS has been on the charger for several hours or overnight and continues to display a blinking white LED, it's likely your lithium-ion battery is bad.
Please email us at athletesupport@nznlabs.com or call us at (951)760-0917 to request a replacement.