Speed Log Posted on June 13, 2017June 15, 2017 by Expert Maritime 0 High accuracy by utilizing the Doppler principle, paired beam eliminating effect of pitching, and velocity correction for change of water temperature. Speed output to ARPA, radar, ECDIS, AIS, VDR, GMDSS equipment, etc. Leave a Reply Cancel reply Your email address will not be published. Required fields are marked *Comment Name * Email * Website