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If you only need to use the GPS accessory to quickly set your recorder's clock and location, you can connect the GPS puck to the recorder until it finds a signal, then disconnect it, and your time and location settings will be saved. You can use a single GPS puck to quickly adjust these settings for multiple recorders.
If you want to use a GPS puck to record location data over the course of a moving transect, or you want to maintain synchronization between an SM3/SM3Bat and GPS time, the GPS puck will need to be attached and receiving a GPS signal for the full recording period.