What Are the Criteria for Choosing Between a Built-in RTK Agri-navigator and a Separate RTK Station?

If you've got one or two tractors and up to 300 hectares, it's better to get an RTK signal subscription. When you're running three or more machines across 500+ hectares, you'll gain more from owning a base station. The financial difference is significant: subscriptions cost £200-400 monthly per tractor, whilst a station runs about £3,000 as a one-off investment and serves all your farm machinery.

How RTK Works and What Makes Systems Different

Standard GPS shows your position with an accuracy of several metres. For precision farming, that's far too much. RTK technology corrects this error down to 2.5 cm thanks to corrections from a base station. The principle is straightforward: there's a reference point with precise coordinates that compares its actual position with what the satellite shows and transmits the difference to your receiver.

Built-in agri-navigators receive these corrections via the internet from companies that have installed networks of stations across the country. You pay a subscription, switch the system on, and you're working. Your own station sits on your farm (usually on a building roof or mast) and broadcasts the signal to your machinery within a 50 km radius.

What It Actually Costs

Let's take an example of a mid-sized farm with 800 hectares and three tractors. Equipment for a subscription on one tractor will set you back £5,000-10,000. Plus monthly fees averaging £320. Over a year, that's £3,840 or roughly £11,500 over three years per tractor. For three tractors across three years, you're looking at £34,500 just on subscriptions.

Now for your own station. A base station with everything needed costs approximately £3,000. Each tractor needs a rover receiver at £1,100. Together, for three machines, that's £6,300 as a one-off payment. The difference is obvious, but there are nuances.

When Your Investment Pays Back

If you use your own station across three tractors, it'll pay for itself in 14-16 months. The more machinery, the faster the payback. On farms of 1,500+ hectares with five units of equipment, the station breaks even after just 10 months of operation. The main saving is in having no monthly payments eating into your budget year after year.

What Suits Different Farms

Small farms up to 250-300 hectares typically have one drill and one sprayer. For them, a subscription makes more sense. Why pay £6,300 upfront when annual subscription costs will be £1,200-1,500? You can even pay just for the season if your provider offers that option.

It's a different story when you're farming 600-2,000 hectares with plenty of kit. Here, your own station delivers real savings. It covers all fields within a 50-kilometre radius, doesn't depend on mobile coverage, and requires no ongoing payments. Plus, you can add new tractors without increasing subscription fees - you just need to buy another receiver.

Internet and Coverage

Subscriptions work through mobile internet. In most cases, that's not a problem because modern modems with dual SIM cards switch between operators in seconds. But if your fields are in coverage black spots or you work nights when the signal's dodgy, there might be delays.

Your own station transmits via radio or GPRS regardless of internet availability in the field. The main thing is that the station itself is connected to the network and has uninterruptible power. This is critical for remote farms and those working actively during the night.

Accuracy and Resource Savings

Both subscriptions and your own station deliver 2.5 cm accuracy under normal working conditions. This reduces pass overlaps from 20-25 centimetres (with standard GPS) down to 2-5 centimetres. In practice, you save 3-4 percent on seed and up to 15 percent on fuel through optimised routes and elimination of unnecessary passes.

Autopilot with RTK lets operators work longer without fatigue because they don't need to constantly watch the rows. This directly impacts productivity during busy seasons. Plus, there's less crop damage from running over already-treated areas.

Maintenance and Support

Network solutions are convenient because technical support is included in the subscription. Something breaks, you ring up, and wait for a specialist. With your own station, you'll either need to sort it yourself or arrange a separate maintenance contract. That's somewhere around £1,500-2,000 annually plus call-out costs when things go wrong.

On the other hand, your own station gives you complete control. You can configure it to your needs, not depend on provider schedules and policies. If you've got someone technically minded on the farm, maintenance isn't difficult.

What rtk-navigation.com Advises

Specialists recommend calculating costs three to five years ahead. Consider not just equipment costs but also subscriptions, maintenance, and potential savings on fuel and seed. For farms around 500 hectares, the optimal solution is often your own station with a backup subscription for technical emergencies.

If you're unsure, start with a subscription for one season. See how the system works, how much you actually save, whether coverage is stable across your fields. Then you can move to your own infrastructure with a clear understanding of your needs. A consultation with rtk-navigation.com will help calculate specifically for your farm which investments will justify themselves.