The Polish 11 operator uses a custom modem to broadcast digital messages. Its various waveforms are designated F03 (FSK and MFSK) and P03 (PSK).

All digital schedules are twice weekly, follow year-round UTC (no daylight saving), and consist of 2 identical transmissions 5 minutes apart. Typically, each day of the week carries a different message, which is repeated week after week until it's replaced at beginning of the next month. Null messages do not appear to exist in these modes.

Most, if not all, digital schedules are associated with E11 and S11a transmissions taking place on the same days of the week, although the exact nature of this relationship is not established. The associated analog and digital broadcasts can be anywhere between a few minutes and a few hours apart.

The following 12 variants of F03 and P03 are currently on the air. The related variants are highlighted using the same color.