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ArduSimple – high precision RTK survey equipment and solutions made simple

RTK correction services and NTRIP Casters in Japan

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✈︎ ArduSimple delivers to customers in Japan in 1-3 business days!

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If you’re in Japan and need centimeter-level position accuracy, you’ll need access to an RTK correction service or NTRIP Caster via the internet. Below are the main options available, explained in a simple way so you can quickly choose what fits your project.

In order to access real-time services and obtain NTRIP credentials, you need to register on the website or send them an email. The registration process is not always very user-friendly, so it might take some effort. If you run into any difficulties, contact us – we’re happy to assist.

National RTK network in Japan

We are not aware of any National RTK Network in Japan. However, the Japanese government has established the QZSS satellite system, also known as Michibiki. This system offers two services through the L6 band (L-band): CLAS, which provides centimeter-level correction data, and MADOCA, which offers decimeter-level correction data across Japan, both available for free.

To access these services, we recommend using our Japan CLAS Corrections L6 Receiver NEO-D9C along with your receiver. This setup will enable you to start receiving correction data via L-band from CLAS, achieving centimeter-level accuracy.

The QZSS service operates on the Japanese Geodetic Datum 2011 (JGD2011), which is aligned with the global International Terrestrial Reference System (ITRS/ITRF).

Free international RTK correction services in Japan

These free services are a good starting point, especially if you want to test or keep costs low. However, they come with some limitations, mainly in terms of reliability, accuracy, or coverage. You can use them to achieve centimeter-level accuracy in Japan if you are lucky to have a base station close to you (remember that RTK only works up to 35-50 km).

ServiceTypeAccessAccuracyCoordinate System
RTK2GOFree global community-based networkRTK2GO coverage map ("View all" on the top right) RegisterNetwork without quality of the service
✔ Great if you only need pass-to-pass accuracy and you don't need to compare measurements taken by other systems or with local maps. Community-based RTK networks are the cheapest way to go, but are maintained by individuals, so quality depends on the area.

✖ Not suitable for surveying calibrated applications.
Not standardized
IGSFree global serviceIGS coverage map RegisterHigh quality service with absolute accuracy but low density of base stations.
✔ It is more reliable than community networks. You can use it to achieve centimeter-level accuracy if you are lucky to have a base station close to you.

✖ Limited coverage and low base station density. Check the coverage map to see if you have a base station nearby (remember that RTK only works up to 35-50 km).
Global ITRF
Earthscope (previosly UNAVCO)Free (for non-commercial use only) global serviceEarthscope coverage map registerTypically ITRF, but bases are in reginal frames

This tutorial walks you through How to connect to the NTRIP correction service (like RTK2GO) via PC.

Paid international correction services in Japan

If no nearby base station is available in free networks, if you require guaranteed service quality, or if your project demands reliable absolute accuracy aligned with a consistent reference frame, consider the following paid correction services in Japan:

ServiceTypeAccessAccuracyCoordinate System
Swift Navigation SkylarkPaid service: from $69/month (1 cm RTK) or $29/month (sub-decimeter RTK-SSR, unlimited use).
Try it for free with the Skylark 6-Month Trial (no payment required).		Skylark coverage map and free trial. To help you started, we prepared a tutorial.1 centimeter RTK accuracy; sub decimeter RTK-SSR Global ITRF

Set up your own correction service

If you didn’t find anything nearby you or you simply would like to become independent from any service, check out our ready-to-use all-band, full-constellation RTK Base Station. Setup is simple—just follow the User Guide: RTK Base station.

Galileo HAS: a free option but lower accuracy compared to RTK

If 40 cm accuracy is sufficient for your project, you can try Galileo HAS, a free, globally available correction service.

  • It works without the internet, NTRIP, or a local base station. While not as precise as RTK, it can still improve positioning accuracy. However, it takes up to 5 minutes to reach full accuracy, compared to just a few seconds with NTRIP.
  • Galileo HAS uses the GTRF reference frame, which is closely aligned with ITRF global coordinate system (differences are typically below 3 cm). This means you will usually have to do a conversion to local coordinate system to compare measurements with other maps.
  • Not all RTK boards are compatible with Galileo HAS. Here are GNSS RTK receivers that fully support Galileo HAS:

Post-processing (PPK) in Japan

If you are looking for post-processing (PPK) instead of RTK in Japan, contact us — we’ll help you find the most appropriate service for your project.

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