Just read the kernel docs. It says about the DeLorme's USB Earthmate:
The Earthmate starts out at 4800 8N1 by default...
Any chance the Baud settings are incorrect?
Regards,
Joop
- Bug#363544: tk2: unable to use ttyUSB0 Joop PG4I
- Bug#363544: tk2: unable to use ttyUSB0 Dan Jacobson