EV1 FAILING

[Chuck - Raymarine - Moderator]

ifmdlvey,

As indicated within my initial response, early EV-1/2 Sensor Core software was dependent upon having accurate speed through water data. Very inaccurate speed though water data, such as may be encountered with a fouled paddlewheel, would cause the Evolution autopilots to exhibit symptoms such as you have reported. Within later software revisions, should the EV-1/2 detect inaccurate speed, then GPS SOG would be used by the autopilot. The Evolution autopilot software updates additionally included a configuration setting to specify whether Speed or SOG would be used by the autopilot.