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Grand Prix Load Sensors for Standing Rigging

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Accurate static and dynamic rig data.

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Compatible with marine electronics.

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Free shipping for all online orders (Products sent DDP, local taxes may apply)

Load Sensors for Standing Rigging

smarttune is designed to replace your existing turn screw.


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Live Data to your Phone or Instruments

Live, static & dynamic load data to your phone via the smartfittings app, or to your on-board instruments via our gateway.

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Stu Bannatyne

Four-Time Winner of the Volvo Ocean Race

“Matching forestay tension to the wind and sails is key to upwind performance “

Eddie Warden-Owen

Former Sailmaker and America’s Cup Coach

“Forestay sag is measured by forestay load, and controlled by rig and backstays. Accurate knowledge of forestay sag enables you to repeatedly adjust this to give the optimum sail shape for best performance throughout the race”

Hannah Diamond

Ocean Race Competitor and Olympic Campaigner

“Installing smarttune is as simple as taking turns off a turn screw to adjust the mast rake – this is definitely a system anyone can install on their boat.”


Learn and Repeat Fast Settings

Set your rig up to known settings and see the real-time effects of  adjustments to match conditions.

Built to Survive the Toughest Ocean Environment

smarttune is durable and waterproof (beyond IP67), tested to destruction and built to withstand all the elements and rigours of the deck.

Assured Accuracy

smarttune is factory calibrated for immediate use out of the box and accurate to within 1% of maximum working load.


Data logged through the smartfittings manager app, integrated with GPS & ready for export to sailing analytics software.


For Boats of all Sizes

Available in 8 sizes, from 1/4” to 1” (turnscrew size) meaning there’s a smarttune for every boat.

The Latest Wireless Technology

No need for cables or wires, the device communicates with your phone over distances of up to 15metres while sailing, and with on-board instruments via our gateway over longer ranges.

Low weight, low widnage

Designed by engineers from Cambridge University in collaboration with sailors. Precision design, optimised for low weight and low windage. 


Paired with our gateway, smarttune is compatible with most modern marine electronics systems.

Find out more about connecting smarttune to your displays. 

Battery Life

smarttune is powered by easy to source batteries: 1 x CR2032 for 1/4″ & 5/16″ turnbuckle size, 2 x AAA for 7/16″ – 7/8″.

smarttune 1″ is rechargeable via wireless charger.

With approximately 6 months of battery life.

smarttune Range

Smarttune 1/4”

Smarttune 5/16”

Smarttune 7/16”

Smarttune 1/2”

Smarttune 5/8”

Smarttune 3/4”

Smarttune 7/8″

Smarttune 1″

what size smarttune sensor is right for my boat?

The easiest way to figure this out is to measure the male threaded stud that is screwed into your current turnscrew or get in touch and we should be able to help you. The different sizes correspond to the thread sizes:

Imperial ThreadThread Diameter (Metric)
1/4″ 6.3mm


smarttune feeds data to your phone via the smartfittings app straight out the box.

Paired with a gateway smarttune has proven compatibility with:

B&GSailmonGarminnkeYacht DevicesExpedition marineRaymarine A+TActisense 
Chartplotters, Displays & Data LoggersVulcan, Zeus³, Triton², Nemesis,Element 7, 10, InkGPSMAP, GMI20, GNX120, GNX130Multigraphic,
Topline bus via Box N2K
Voyage Recorder YDVR-04N/AAxiomBFD, MFD, 3020, MINIW2K-1
ProcessorsH5000, WTP-3E4N/AN/AN/AN/AN/AATP1, ATP2, ATPXN/A
SoftwareDeckmanNavDeskN/AN/AN/AExpedition Navigation & Sailing SoftwareN/AWeb server, ExpeditionN/A
N/A = No Applicable product from this brand.
If your system is not listed, please contact us and we may be able to provide a solution. We are working hard to add to our list of compatible systems.

Improving upwind performance with smarttune