If you study navigation at the Coast Guard or a boating school, you are taught what is called Dead Reckoning or sometimes Ded Reckoning.

FORBES: DEDuced Reckoning is Assembling the Mosaic!

The design, development and implementation of the NLP is based on a tripartite partnership between the NCHD, District Education Department (DED) (including schools and teachers) and communities (including volunteer literacy teachers).

UNESCO: National Literacy Programme (NLP)

In 1990, the Municipality of El-Agustino District, located in the Metropolitan area of greater Lima in Peru, asked the German Volunteer Service (DED) for technical assistance to ameliorate the burning problems of waste management within the district boundaries.

UNESCO: Background