This method stops a call to the Positioning and Navigation device.
HRESULT StopCall ( hPNDevice hPN, PNData_t Call );
One of the values described in the following table is returned.
| Value | Description | 
| S_OK | Success | 
| E_FAIL | An unspecified error occurred. | 
| E_INVALIDARG | One or more arguments are invalid. | 
| PNAPI_E_DEVICEUNAVAILABLE | The Positioning and Navigation device is unavailable; it could be unplugged or dead. | 
| PNAPI_E_NOCALLSTARTED | No call has been started yet. | 
If a call has been started using IPosNav::StartCall with the dwPeriod set to 0, then the call does not need to be stopped with IPosNav::StopCall. A value of 0 indicates the call is made once, and then stopped.