Farmers make decisions every day that affect farming operations. Many of the factors that influence the decisions they make cannot be predicted with complete accuracy, but accuracy is a starting point for decision making; the risk continuously appears, when it comes to tractor upgrade. A wide range of tractor pumping points exists nowadays in the agriculture market, but which one to choose? Where pitfalls may occur? Journalist James Andrews recently made an article about the independent GPS systems overview with feature comparison and pricing points.
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Jump in investment

In all cases, there is a significant jump in price from the most basic offerings, and buyers are introduced to a new world of unlocking fees and annual subscriptions for correction signals. These can seem hard to swallow, but the reduction in input costs from fewer overlaps generally results in quick payback times. Most manufacturers in this sector operate a modular setup, so, once the initial investment has been made, it’s less expensive to add the kit onto other machines and access features such as variable-rate application and automatic sprayer section control. Many people will also purchase a few extra components so the system can be transferred from the drilling tractor to the sprayer and then to the combine. In this article, we’ll concentrate on a large number of second-hand and new tractors in the UK that didn’t come out of the factory auto-steer ready. This means they don’t have the necessary smart steering valves that aftermarket GPS units can plug into. Although these valves can be retrofitted, the free can run to many thousands of pounds, so in most cases, it makes more sense to opt for a motorised system that attaches to the steering column. Early versions of these were a little crude, but current models can deliver accuracy approaching that of integrated arrangements. We take a look at four setups from the main players in the UK, plus eFarmer’s FieldBee option, which can. be ordered from the Netherlands. Discounts are likely to be available on some of the prices quoted and many firms will offer to buy back older displays, which helps lower costs.

GPS signals at a glance

Basic GPS No differential correction means accuracy is 2-5cm. Examples include GPS, Glonass and Galileo. Differential GPS Free correction signals provided by Egnos and WAAS, with 30cm pass-to-pass accuracy (most lightbar systems). High-perfomance differential GPS More accurate subscription-based correction signals, provided by the likes of Omnistar, offer pass-to-pass accuracy of 15cm to 2.5cm. RTK The most precise and consistent correction signal, with repeatable accuracy of 2.5cm or less. It requires a base station or a subscription to access others. Most manufacturers have networks and there are several independent options. The signal can be sent over short distances by radio and further with mobile internet.


Raven GPS systems are available in the UK through Dempsey Precision, which is run by Vince Dempsey. Display There are two auto-steer-compatible displays from Raven – the 7in CR7 and the 12.1in CR12. Both work with the firm’s high-accuracy GS correction signal, and with the relevant unlock codes and antenna they cost £1.680 (1960 eur) and £6.410 (7500 eur) respectively. The CR12 includes more features than the CR7, but the smaller screen can have several upgrades, including unlocking the variable-rate controller for £780 (900 eur). Both screens can be made Isobus compatible for a one-off fee of £820 (960 eur). Signal Raven’s GS correction offers pass-to-pass accuracy of 4cm or less, making it well suited to most drilling jobs. An annual subscription is £1.230 (1430 eur), but there is the option of having it for three months for £495 (580 eur). In this instance, the system will still work on Egnos with 30cm accuracy for the rest of the year. For those who want year-on-year repeatable accuracy, it can be upgraded to RTK. Steering system Raven offers a bolt-on steering wheel kit but, in most cases, Dempsey Precision recommends fitting non-auto-steer-ready tractors with an integrated hydraulic steering valve. This operates like a factory-fitter system and is actually slightly cheaper than the steering motor kit. The valve and its ECU hydraulic driver unit cost £1.850 (2200 eur), installation is about £900 (1050 eur) and there is roughly £250-worth of the pipework, depending on where the valve themselves. Opting for an MD electric steering wheel system is £200 (240 eur) more, but the benefit is that it’s simpler and cheaper to swap between machines. Basic transfer kits start at about £530 (620 eur).
Guideline prices System price £10.110 (11700 eur) – including CR7 displays with the retrofitted hydraulic auto-steer system, one-year GS signal subscription and installation (based on a Massey Ferguson 7618) Optional extras Hydraulic transfer kit, allowing the system to be mowed to another tractor – £5.250 (6100 eur)(based on Massey Ferguson 7620) including pipes and installation. Ongoing subscription Raven GS correction signal – £495 (580 eur) for three months, £1.230 (1430 eur) for 12 months, £3.360 (3900 eur) for three years, or £5.240 (6100 eur) for five years. Optional to hire For those who don’t want the capital outlay of a full auto-steer system, Dempsey Precision offers a couple of hire options, both of which it supplies with an RTK correction signal. For tractors that aren’t auto-steer ready, the owner needs to commit to having the system for a minimum of three years. Dempsey Precision will then install a hydraulic steering valve and charge £1.500 for the autumn. Those operators with an auto-steer-ready tractor only need to commit to six months at a time, for £1.500 (1700 eur).

Ag Leader

Ag Leader products are sold in the UK via Cumbrian dealer Precise Solution, headed by Derek Johnson. Display Two displays are offered, both of which are capable of RTL guidance. The Compass is the entry-level model, with a relatively small screen and limited functions, while the large, tablet-like in Command brings a few more features, such as a split-screen view that allows simultaneous monitoring of Isobus implements. Both units have a field finder that automatically selects the field from a list, as well as the ability to record field sizes and boundaries. Prices for the Compass start at £1.963 (2300 eur) (guidance only) and with the hardware for RTK jump to £7.883 (9200 eur). Upgrading to the In Command display costs an extra £1.200 (1400 eur). Signal The firm’s Terrastar-C Pro signal offers 2.5-5cm pass-to-pass accuracy, suitable for drilling. However, according to Precise Solutions, the relatively small jump in price to its RTK setup tempts many buyers to upgrade. It also removes the worry of lost signal and time spent waiting for the receiver to acquire it. Buyers can connect to their own compatible base station or access Precise Solutions’ RTK network, which covers the UK and Ireland. Annual subscriptions for this are £650 (760 eur), which includes data SIM cards and removal support for the steering system. Those with In Command displays also get satellite imagery. Steering system For tractors that aren’t auto-steer ready, Ag leader offers its Ontrac 3 bolt-on steering wheel and there is a clip-on drive unit to control turning. The original wheel can be retained and swap-ping to another vehicle is pretty simple. Guidelines prices System price £12.990 – Including Compass display with relevant licences, auto-steer system, one-year Ag Leader RTK subscription and installation (based on an MF 7618) Optional extras £12.990 (15100 eur) – Including Compass display with relevant licences, auto-steer system, one-year Ag Leader RTK subscription and installation (based on an MF 7618) Ongoing subscriptions Transfer Kit for fitting to another tractor – £1.243 (1450 eur) (based on an MF 7618)) Ongoing subscriptions Ag Leader mobile RTK signal – based on an MF 7618)650 (760 eur)/year or a subscription to another compatible network.


Trimble’s agricultural GPS equipment is sold by Soil Essentials in Scotland and Vantage England and Wales south of the border. Vantage England and Wales is a subsidiary of Cambridgeshire-based precision farming firm AS Communications and was formed purely for the Trimble side of the business. The Irish market is served by Vantage Ireland. Display Trimble offers four displays that are capable of receiving correction signals accurate enough for drilling. Prices for these start at £4.595 (5350 eur), but buyers will also need to pay an unlock/license fee before the display can access a more accurate signal So realistically, the fees for displays capable of drilling accurate range from £4.534 (5300 eur) to £6.946 (8100 eur) According to Vantage, the GFX 750 is one o the most popular for this sort of setup, as it has a large display, runs the newer-type Precision IQ software and can be upgraded in the future. It costs £6.141 (7200 eur), including a licence for the firm’s Centrepoint RTX signal Signal The first step up from the free Egnos signal is Trimble’s Rangepoint RTX that offers sub-15cm accuracy. Some customers can drill successfully with it, but the Centrepoint RTX with sub-2.5cm pass-to-pass accuracy is the better bet. This comes in in “standard” and “fast” versions, with the latter offering a quicker convergence time for more precise work and year-on-year repeatability. signal Apparently, some customers are able to drill successfully with it, but the Centrepoint RTX with sub-2.5cm pass-to-pass accuracy is the better bet. This comes in in “standard” and “fast” versions, with the latter offering a quicker convergence time for more precise work and year-on-year repeatability. signal The next step up in the UK is RTK, which has an instant convergence time and no satellite drift, making it well suited to controlled traffic farming systems that confine vehicles to the same lines year after year. The mobile version requires an additional GMS modem and has a £750 (870 eur)/year subscription fee. Radio versions work over shorter distances and fees are at the discretion of the individual or firm that owns the mast The mobile version requires an additional GMS modem and has a £750/year subscription fee. Radio versions work over shorter distances and fees are at discretion of the individual or firm that owns the mast Steering system There are two systems on offer from Trimble. the simplest of which is the friction-drive EZ-Steer unit that’s been around for years. It’s a motor with a foam rubber wheel on the end that engages with the steering wheel It is capable of driving accurately enough for drilling duties, but as it is still relatively expensive, many buyers go for the EZ-Pilot version that mounts directly to the steering column in place of the original wheel. The EZ-Steer costs £2.500 with GFX 750 display and the EZ-Pilot with Pro operating software is £3.396. Guideline prices System price £13.358 (15600 eur) – including GFX 750 display with relevant licences, auto-steer system, one-year Centerpoint Fast subscription and installation (based on a Massey Ferguson 7618) Optional extras Transfer Kit allowing the system to be mowed to another tractor – £1.361 (1600 eur) (based on a Massey Ferguson 7618) Ongoing subscriptions Centerpoint correction signal – £650 (760 eur)/year.


Cambridgeshire-based specialist LH Agro distributes aftermarket Topcon Agriculture Kit. Display Topcon offers two displays capable of auto-steer guidance accurate enough for crop establishment. The key difference is screen size, with the X25 measuring 8.4in and X35 12.1in. However, the X35 also has some extra features, mainly the inclusion of Task Control (section and rate control) for Isobus implements as standard. The X25 costs £4.679 (5500 eur). Topcon’s AGI-4 GPS receiver is separate from the display and features a built-in steering controller. This can handle most auto-steer-ready vehicles without additional hardware. The AGI-4 also houses the licence for the relevant correction signal. Configured for RTK, it costs £9.675 (11300 eur) Signal Topcon’s medium-grade Topnet Global D correction signal offers 8-10cm accuracy, meaning it’s just about precise enough for drilling. However, its activation fee is close to that of an RTK setup, so, in most cases, it’s worth upgrading and getting 2.5cm accuracy. The firm has a network of base stations across the UK that can communicate with the tractor via radio signal or the mobile phone network. An annual RTK subscription cost £650 (760 eur) and, if required, this includes data and a roaming mobile SIM card that works across all networks Steering system The AES-35 electric steering wheel system is a simple option to convert tractors in place of the original wheel. The basic unit costs about £3.500 (4100 eur), with some slight variation on price depending on the vehicles. Various adapter bosses are available to fit most machinery makes and buying additional kits can speed up swapping between machines Guideline prices System price£12.975 (15100 eur) – including X25 display, AGI-4 RTK receiver with NTRIP modem and UHF radio, auto-steer system, one-year RTK subscription and installation (based on a Massey Ferguson 7618) Optional extrasTransfer kit allowing the system to be moved to another tractor – £595 (700 eur) (based on a Massey Ferguson 7618) Ongoing subscriptionRTK signal (radio or mobile phone) – £650 (760 eur)/year.


FieldBee Dutch and Ukrainian precision agricultural firm eFarmer is one of the few smaller GPS providers that can offer a bolt-n kit capable of autosteering a tractor to RTK accuracy It was formed in 2014 and now has some dealers across Europe selling its FieldBee guidance systems. It is yet to have a dealer in the UK, although is looking to appoint one This does means buyers will need to fit the system themselves or enlist the help of an agricultural engineer, so there’s no easy option of getting the manufacturer to come out and sort any problems Display Like some of the other smaller guidance system providers, FieldBee runs all of its guidance through an Android app that can be installed on any compatible tablet or smartphone. The basic version is free to download, but the full-spec option required for auto-steer is subject to a €119(£104)/year subscription The buyer will need to provide their own tablet, but Android units can be picked up fairly cheaper Signal Unlike most of the large GPS providers, FieldBee doesn’t use medium-accuracy correction signals that command a subscription fee Instead, it uses free signals, like Egnos, for lower-accuracy tasks, and RTk where greater precision is required. The firm’s RTK setup is a two-tiered affair, starting with an L1 receiver that only gives accurate results in flat fields without obstacles Those are few and far between in the UK, so its recently introduced L2 receiver is the best bet where drilling accuracy is required – this cost €1.299 (£1.137). Those who can access a local NTRIP RTK base station (either owned by a neighbouring farmer or a network) can simply pay to access the signal. But where there is no option of this or the buyer would like to avoid subscription fees, there’s the option of adding an L2 RTK base station that can be installed at the farm. This can broadcast its signal over 2.5lm via radio signal or 20km via mobile internet and cost €1.599 (£1.399). Pass-to-pass accuracy is said to be 1cm. Steering system FieldBee’s steering system is the same bolt-on arrangement that is used by many other firm’s and is built by AgJunction (formerly Novariant). This is by far the most expensive part of the setup and costs €5.699 (£4.986), including the fee to unlock it so it works with RTK/br> It clamps under the existing steering wheel and can be easily removed and transferred to another vehicle Guideline prices Guideline prices System price €7.134 (£6.242) – including receiver, auto-steer system and a one-year subscription to premium software (this is a universal kit to suits most tractor models) Optional extras FieldBee L2 base station to give subscription-free RTK correction signal – €1.599 (£1.399) Ongoing subscriptions €119 (£104) for a premium subscription to the FieldBee app. plus fees to access local NTRIP RTK signal if no base station is purchased
? Source – Farmers weekly
? Printed version – GPS steering systems
✍️ Author – Oliver Mark ( from Proagrica (UK)

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