| Constant | Description | Value |
| GPSCOMMERROR_BREAK | Break detected | 0x00000001 |
| GPS_COMMERROR_FRAME | Framing error | 0x00000002 |
| GPSCOMMERROR_OVERRUN | Overrun | 0x00000004 |
| GPSCOMMERROR_RXOVER | Receive overflow | 0x00000008 |
| GPSCOMMERROR_RXPARITY | Parity error | 0x00000010 |
| GPSCOMMERROR_TXFULL | Transmit buffer full | 0x00000020 |