Boat speed through water

hmscapecod

Lieutenant
Joined
Apr 6, 2012
Posts
65
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Does anyone have any advice on what is good equipment for getting an accurate speed of the boat through the water? I feel this would helpful when trolling the hoos around up tide and down tide.
 

fortier256

Captain
Joined
Feb 10, 2013
Posts
701
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349
Location
Narragansett Bay
Boat Make
Fortier 26
Boat speed

I have a Tri Data St 60 that I calibrated with GPS under calm conditions with slack current. It allows me to see boat speed thru the water. Also the difference between the two readings while underway (GPS / Tri Data) gives me the speed of the current.
 

petrel

Rear Admiral
Joined
Dec 17, 2011
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1,583
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Location
NC
Boat Make
56' DMR, 31' BHM
Speed through the water. Go uptide, downtide, look at the GPS each way and do the math. 8 knots+6 knots= 14 knots. 14/2= 7 knots. Not saying to troll 7 knots, just an example. Certainly sea conditions, rigging techniques, and target species all call for some variation in speed to achieve an attractive presentation of the baits.
 
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