Received a request for a more detailed list of materials and parts. So here is an updated Bill of Materials (BOM) for version 4 of the buoy. It is built around the Adafruit nRF52 Feather and LoRa breakout board.
*I have not yet integrated the GPS, IMU, RTC, or SD card reader/writer into the newest PCB design with the nRF52 board, so these are missing from the list.*
BOM table was exported from Fusion360 using the Bommer app.