I guess it depends on how that baud rate is being calculated. Since the device isn't sending out a continuous stream of data, the calculation might be based on the rate of characters over time, which would lead to a much lower rate.
[edit] Just looked at the code. Displayed baud rate appears to be calculated by measuring the length of the incoming NMEA strings over time. If the strings are just coming in every second, for example, the measured baud rate would display as much lower than the interface rate.
[edit] Just looked at the code. Displayed baud rate appears to be calculated by measuring the length of the incoming NMEA strings over time. If the strings are just coming in every second, for example, the measured baud rate would display as much lower than the interface rate.