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VLF Digital Information Network (VERDIN) is a VLF/LF communications system that provides secure command and control communications to the strategic and tactical submarine forces and airborne VLF relay aircraft (TACAMO). The VERDIN computer-assisted, multichannel, mulitmode, message handling system is an integral part of the fleet submarine communications network. It is designed to provide reliable, secure, long-range transmission and reception of submarine broadcast messages. VERDIN is being upgraded in accordance with STANAG 5030 to provide U.S./NATO interoperability for SSNs. The Enhanced VERDIN System (EVS) is a VERDIN product improvement developed to provide increased performance, reliability, and maintainability; a capability to process JCS directed 1600 baud mode MEECN interoperability; automatic mode recognition; message compression; automatic recovery/restart capabilities, giant step, high speed run up; and improved operator features for performance monitoring and fault location. The program replaced existing VERDIN processors, and modified the VERDIN equipment with a field change to permit 1600 baud MEECN interoperability on strategic submarines and TACAMO aircraft. The VERDIN/EVS receiver (R-1738) noise reduction circuit (NRC) field change has been incorporated into the EVS. This mod improves receiver performance in atmospheric noise. The non-linear adaptive processor (NONAP) has been provided to increase operational flexibility for submarines by pre-detecting differences between the desired VLF signal and noise interference; thereby enabling reception of messages during severe interference.

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