High quality product of the company AIRMAR from the USA. \ R \ nI ordered the encoder as a replacement for the VDO Ocean-Line-Combi device because the encoder (from 2005) was defective. Here, the display had to be log-calibrated (from 1.0 to 0.1), because the old encoder had a slightly different format for speed in the NMEA protocol.
works technically flawlessly. But the biggest mistake is that he does not have the possibility to build the donor in the water (eg to change the impeller or to clear the vegetation) without causing a real big flood.
Already the 2nd donor of Airmar. Both are defective. Only partial failure, if you can not use it, then total failure. 2 devices, even errors. Schelchte quality and not recommended for serious use.