How does this work with GPS? Do you guesstimate the current speed and set it when driving one way and it automatically adjusts when you turn around? This wouldn't work too well for me as I boat on a tidal river. The current changes speed continuously and changes direction several times a day. At slack tide there's no current. Depending on the position of the moon, time of the tide swing, and any recent rains it can rip pretty fast, at times it can take all you have to swim against the current to get back to the boat if you're just anchored and swimming. I considered zero off but went with a paddle wheel Perfect Pass due to the tidal current. Still curious as to how this works and if it does a good job though.
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