technically you need a cf number even if you have an electric motor but they dont really care. i had an electric motor on my zodiac before i got a gas one and the dfg came around to check our fishing license but they didnt say anything about not having a cf number. flourocarbon is a type of fishing line that has almost the same refractivity (yea i know thats not a word) as water which makes it almost invisible almost water. if you are willing to spend the money get blackwater flourocarbon
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