Here's what the recruiting web site says for NESOP:
What They Do
Naval Electronic Sensor Operators (NES OPs) are responsible for the operation of all shipboard ELECTRONIC WARFARE and FIRE CONTROL equipment. You, as a member of the ship’s Combat Team, would be instrumental in detecting, locating and identifying both friendly and enemy ships, aircraft and submarines. You would also perform an integral element in engaging the enemy and defending your ship and those in consort with you. You will then be provided the opportunity to begin to supervise various occupational functions and may advance to supervisory positions where you will direct, guide and lead your Above Water Warfare Team in both offensive and defensive actions.
Specific duties of the NES OP include:
Operate highly advanced radar detection equipment to detect, locate and identify friendly and hostile radars at sea, in the air and those located along the coastlines
Operate radio detection and intercept equipment to analyze and disseminate various communications from other ships, aircraft, submarines and shore bases
Operate gun/missile-firing equipment, used in both defence and offensive operations of your ship against various threats such as ships, aircraft, missiles and shore based units. You as a NES OP are the integral component in the firing and controlling of the ship’s main weapon systems, all close-in weapon systems and the launching of anti-air and anti-surface missiles.
You will be tasked to conduct intelligence and evidence gathering using the equipment listed above as well as specialized photographic equipment. While performing these duties, NES OPs work with classified material and sometimes assist other governmental agencies such as the Department of Transportation, Department of Fisheries and Oceans or various Federal and Local law enforcement agencies.
http://www.forces.ca/v3/engraph/jobs/jobs.aspx?id=276&bhcp=1
Here's the list for NCIOP.
What They Do
Naval Combat Information Operators (NCI OPs) are responsible for the operation of all shipboard surveillance radars and associated equipment of the Command Control Communications Computers Intelligence Surveillance and Recognizance systems, known as (C4ISR). As NCI OPs progress through the occupation they are given greater responsibility, for example, being accountable for the compilation of the tactical Air, Surface and Underwater pictures, which are provided to Command for tactical decisions. NCI Ops are highly versatile operators who are integral members of the Ship’s Combat Team.
As members of the ship’s Combat Information Organization, Naval Combat Information Operators assist and advise the ship’s Command in Navigation (Anti-Collision), Anti-Air Warfare (AAW), Anti-Surface Warfare (ASuW) and Anti-Submarine Warfare (ASW), utilizing data derived from passive and active systems during operational deployments, taskings and local area exercises
Configure and operate the Combat Control System (CCS), ships Radars, Identification Friend or Foe (IFF) Feature, C4I Systems, Multi data Links, Global Command and Control System, information processing systems, Shipborne Integrated Communication (SHINCOM) equipment and related sub-systems
Analyse equipment and system performance, conductivity and faults on all associated Combat Information (CI) equipment using Built-In, Integrated Test Equipment (BITE) and perform basic on-line fault diagnostic procedures
Collect, correlate, record, analyse, display, and disseminate all tactical information utilizing military databases, e-mail and intelligence in the Operations Room. This information is provided from local, national and international sources
Maintain classified logs and publications, including performing corrections, doing amendments, inserting and removing pages and page mustering corrected publications
http://www.forces.ca/v3/engraph/jobs/jobs.aspx?id=275&bhcp=1
Do you have questions about any of these things?