Yes and no,
if you connect the easyTRX3 only by USB, only the microcontroller is active!
That`s fine for programming your shipdata already at home.
There is an easy reason for that:
The max. current from your USB socket is approx. 500mA.
But if the easyTRX3 should transmitt, we need for 26ms a current of 2A.
Thats absolutely too much for USB.
If you are connected by USB only, following parts are inactive:
-WiFi deactivated, if available
-GPS receiver and internal antenna deactivated
-AIS transmitter and receiver deaktivated
If you are connected by USB only you´ll see following LEDs: