Who won: WECDIS & Combat System Interface Unit (WIU CSIU)

A public sector contract from Defence Equipment and Support. Below: what it involves and how to write a winning bid for it.

Buyer

Defence Equipment and Support

Published

28 September 2026

Region

UKK12

About this contract

The National Armaments Director Group, part of the Ministry of Defence, intends to award a contract for the design, manufacture, installation and assurance of a replacement Warship Electronic Chart Display and Information (WECDIS) Interface Unit (WIU) and Combat System Interface Unit (CSIU) (together the Interfaces) to OSI Maritime Ltd (OSI). The contract will be for a term of two years and have an estimated value of £15m (inc VAT). It is considered that this contract can be awarded under Section 41 of the Procurement Act 2023 because the direct award justification specified in paragraph 6 of Schedule 5 (single supplier - technical reasons) applies. This is because the WIU and CSIU are required to interface with an upgraded WECDIS being procured from OSI (and which was the subject of a separate transparency notice 2025/S 000-074667 published on 18 November 2025 and both Interfaces need to be integrated into the wider architecture of systems currently installed on Royal Navy platforms, all of which are supplied, supported and assured by OSI. These include the Electronic Chart Precise Integrated Navigation System (EPCIS) and Warship Automatic Identification System (WAIS). Only OSI ha

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✓Answer against the marking scheme, not the question text — Defence Equipment and Support scores each response, so map your evidence to the published criteria and weightings.
✓Lead with evidenced capability and social value — for public sector work these usually outweigh price.
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✓This one's been awarded — but Defence Equipment and Support retenders on a cycle. Get matched the day the next one lands and start your draft early.

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