Here is what it says about eNtM's on the ChartWorld website:
ChartWorld eNtM delivers digital Notices to Mariners (NtMs) on a weekly basis. The service includes paper chart tracings and corrections for all other publications previously delivered in the paper NtM format.I've been working on the idea of adding NGA products including the Notice to Mariner information to the ChUM interface due to a request from the Navy (you can see a demo version here) to see MODU's (mobile oil drilling units) and Broadcast warnings.
eNtMis integrated with ChartWorld’s digital chart catalogue ChartBrowser. The outstanding user-friendliness of the tool, combined with low volume data transmission and attractive monthly fees, is a breakthrough method on the market. Each vessel is provided with a complete database of digital NtMs of the last three years. This enables the crew to autonomously manage its paper chart and nautical publications inventory aboard. eNtM can be used as a stand-alone product or along with the compliant eSeries service, ChartWorld’s solution for ECDIS.