Navigation Instruments EM Log and Doppler Log

Education and technical information about EM Log and Doppler Log for deck officers

[@reneruepert904]

A very clear description of the workings of these logs. Thank you

[@user-bu8bo5gc4v]

Thanks for the video u put out

[@ElnurMammadov-pm9de]

Hello. Which one is better. Ground or water?

[@hhjzjsj]

SOG is better as it is a fixed point of reference for the sonar to reflect off, limitations is the depth of water where the sonar
cannot reflect off, Usually around the 200m mark.
Anything greater than 200m in depth, STW is used to reflect off particles in the ocean or anything else it can find