SKIPPER SD21 Speed over ground (SOG) Speed log with built in STW sensor
- Speed over ground (SOG) in three axis (Docking mode)
- Speed through water (STW) in one axis
- Colour 9" touch screen with day/night screens and Compact dot LED display
- NMEA 0183 output
- LAN
- GPS, GLONASS (SOG) and Doppler speed (STW)