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This is Mark II of the Whirligig project https://www.robotshop.com/letsmakerobots/node/16995 code name SEA RENDERING (it’s not actually a code name, just an anagram for my name :-) ) The purpose of this robot is to have it log water depths along a predefined set of waypoints. It stores its data on memory sticks or on SD cards. The estimated runtime is about 24 hours and with a top speed of 3km/h it will travel roughly 72km. With a log entry for every 10m this would give us over 700 depth measurements ...
This is a companion discussion topic for the original entry at https://community.robotshop.com/index.php/robots/show/sea-rendering