Rns 315 Instructions -

Likely a bad map SD card. Eject the map card from the right slot. If the radio stabilizes, buy a new official map SD card. If it still reboots, the internal battery (for GPS memory) has died, requiring professional repair.

Press the Phone button on the unit. If no phone is connected, select "Search for phone." rns 315 instructions

Map updates are sold as one-time-use SD cards. Likely a bad map SD card

Turn on your phone's Bluetooth and ensure it is "visible." rns 315 instructions

If the other person can't hear you, the microphone is likely misconfigured.

Unlike newer systems that update over Wi-Fi, the RNS 315 requires a physical SD card for map updates.