Dimension scores are derived from public data and fields; weighted into the composite. Reference only.
This website is built around 日本の空港, a set of reference materials on Japanese airfields and heliports for VFR pilots, rather than a live course, recorded course, or one-on-one training service in the usual sense. Its positioning is closer to an aviation operations reference book/database, serving small aircraft, helicopters, and general aviation flight scenarios. The main text states that the publication was first released in 1987 and has been continuously updated since then, covering 110 airfields and 18 heliports nationwide from Hokkaido to Okinawa, with some information on off-airfield landing sites as well.
In terms of category, this is an aviation reference and VFR flight-support resource. Its focus is not instructional teaching, but providing airport, navigation, and operational-change information for pre-flight preparation and cockpit reference. No teaching format is presented, so it cannot be evaluated as live, recorded, or 1v1 training. There is also no mention of certification or certificates. In terms of language, both the website and the materials are in Japanese, making them naturally more suitable for users who can read Japanese and are interested in Japanese airspace and airport information. As for the organization behind it, the text emphasizes that it is manually edited, published, and sold from Hakodate, Hokkaido, and that it has long been used by small-aircraft and helicopter pilots; continuity is one of its strengths.
The website mentions that the print edition uses a custom 4-hole ring binder and consists of Vol.1 and Vol.2, making it convenient for cockpit use. Updates are mailed as paid supplements and are sent only to users who apply for them. Digital versions include a Windows USB edition, a DVD edition, and iPad/iPhone tablet editions. The files are PDFs viewed through a dedicated viewer, with both download sales and packaged sales available. However, the main text does not provide specific prices, payment methods, or overseas purchase conditions, so pricing transparency is limited.
Its strengths lie in its highly specialized positioning, clear update mechanism, coexistence of print loose-leaf and digital editions, and suitability for quick in-flight reference. The latest-information section shows that supplementary updates and digital revisions continue to be released. The limitations are also clear: it is not a structured flight-training course and cannot replace flight-school instruction, license training, or official AIP materials; the digital edition depends on a dedicated viewer, limiting platform openness; and the content focuses on Japan, so it offers limited value for non-Japanese flight environments.
It is suitable for small-aircraft and helicopter pilots conducting VFR flights in Japan, personnel involved in general aviation operations, and anyone who needs to track changes at Japanese airfields. For Chinese users, the text does not provide information on access from mainland China, payment, logistics, or Chinese-language support, so access status can only be regarded as unknown. If the goal is to study aviation knowledge, flight-school courses, official AIP/AIS materials, aeronautical chart services, or flight-planning software may be considered as alternatives or supplements.
⚠ This review is compiled from public sources and does not constitute a purchase recommendation. Verify all facts on the vendor's official site. Verify on dgraph.co.jp official site.
dgraph.co.jp is an Japan Education provider. TG4G tracks its product information, an overall rating of 6.0/10, and a China-accessibility score of Limited (proxy recommended). Click "Visit Official Site" to reach dgraph.co.jp directly.