The difference between Chip log and Taffrail log
When used as nouns, chip log means a simple device for measuring the speed of a vessel, consisting of a wooden board (drag) attached to a line on a reel, whereas taffrail log means a mechanical device dragged from the stern of the vessel that indicates the vessel's speed through the water.
check bellow for the other definitions of Chip log and Taffrail log
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Chip log as a noun (nautical):
A simple device for measuring the speed of a vessel, consisting of a wooden board (drag) attached to a line on a reel.
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Taffrail log as a noun (nautical):
A mechanical device dragged from the stern of the vessel that indicates the vessel's speed through the water; usually consists of a propeller, a reading unit and a stiff line connecting them.