David R. Church has been named marketing manager of SI-TEX Marine Electronics, Clearwater, Fla. He succeeds Ted Hansford who was promoted to general manager.

Mr. Church will be responsible for marketing the SI-TEX line of marine radars, depth recorders, Loran C receivers, VHF radios, and ADF equipment. He joined SI-TEX in 1976 as sales administrator and was promoted to sales manager last year.