Do it yourself datacable for the Oceanic Geo 2.0 (might work for others too)
Total cost around 3€ (nth for me as I had all already at home anyway)
The official Data cable from Oceanic is tooo expensive for the value you get, so I thought about building my own...
As a quick internet search reveals, the Geo 2.0 "talks" basically UART, with only TX, RX and Gnd connected...
As I had a ESP8266 ESP-01 USB Serial Programmer with CH340 lying around anyway, I gave it a try - when you have steady hands, it works flawlessly...
ESP8266 ESP-01 USB Serial Programmer with CH340:
Wiring:
Subsurface import:
Maybe one more hint: The battery has to be full...