Hello,

When running xgpsspeed on my machine, I get the following trace:

Traceback (most recent call last):
  File "/usr/bin/xgpsspeed", line 1015, in <module>
    Main(
  File "/usr/bin/xgpsspeed", line 652, in __init__
    self.widget = NauticalSpeedometer(
                  ^^^^^^^^^^^^^^^^^^^^
  File "/usr/bin/xgpsspeed", line 305, in __init__
    Speedometer.__init__(self, speed_unit)
  File "/usr/bin/xgpsspeed", line 87, in __init__
    raise TypeError(
TypeError: 'km/h' is not a valid speed unit

Explicitly setting the speed unit with --speedunits kmh fixes the issue

There seems to be an incompatibility between what's used in xgpsspeed
and gps/clienthelpers.py

Kind regards,
Laurent Bigonville