In October 2025, a demonstration trial was conducted to demonstrate the distribution of navigational warning information using the Ymir-1 VDES satellite.
This demonstration was carried out with the support of the Ocean Policy Research Institute of the Sasakawa Peace Foundation (Japan) through the joint efforts of Sternula Japan Co., Ltd., Sternula, and the AOS Consortium (Teledyne FLIR TransponderTech, AAC Clyde Space, and ORBCOMM).
First, a dataset of S-124 Navigational Warning messages to be transmitted via satellite was generated in Denmark. The dataset was then sent to the satellite operations centre in the United Kingdom, where satellite health monitoring and operational scheduling of the VDES satellite Ymir-1 are managed. The dataset was subsequently forwarded to a satellite earth station located in Norway and uplinked to Ymir-1 via an S-band feeder link.
Ymir-1 transmitted the S-124 navigational warning message dataset toward the designated test area according to a pre-planned transmission schedule. A VDES terminal (R6 VDES) installed onboard a demonstration vessel operating within the test area received the navigational warning, which was displayed on the vessel’s ECDIS-like screen. At the same time, the received data were transmitted back to Denmark via an LTE connection, and subsequently forwarded to Japan.
Due to experimental licensing constraints in Japan, the test area was located in European waters; however, the navigational warning message distributed during the trial consisted of a “tsunami warning” targeting the entrance area of Tokyo Bay, Japan.
On 5 November 2025, a public demonstration of the trial results was held in Tokyo. Representatives from relevant Japanese government agencies and private-sector organizations attended the event, together with the Technical Director of FLIR TransponderTech, Peter Bergljung (Chair of the VDES Alliance) invited from Sweden, while stakeholders in the United Kingdom and Denmark participated remotely.
Approximately 90 maritime professionals gathered to discuss challenges and potential solutions toward the practical implementation of satellite VDES. The event successfully established a shared understanding among participants regarding future deployment and operational considerations.