Are you working on indoor positioning?
Yes for some time I did. Precisely 2 years.
The data a tracking mechanism requires is:
1- Its own position (GPS, INS based kinematic calculation)
2- Its reference position (Precise known reference location (Ship Coordinates, beacon coordinates, ...)
3- Sensory information or observables from the tracked target (velocity, acceleration, signal RSSI (either reflection of Radar or Transmitted signal from target)), visual reference like the one obtained from IR or Computer Vision approaches.
4- Low overhead of communication all and processing power to form a a feasible Bayesian estimation of all input data.
To attack 1) Spoofing, GPS jamming, Electromagnetic interference (against cheap MEMS IMU's if any), Vibration attacks against more expensive fiber optic or laser based IMU's
To attack 2) Severe connection between the ship and the unit. Fooling reference of the unit in believing its position. Spoofing and taking over the link. Taking out references from ship to satellite. In case of CV aided reference position using target blobs blinding the image taking satellite which Iran already has achieved and demonstrated in RQ-170 case.
To attack 3) all above plus mudding the scenery in visual, electromagnetic and Infrared domain and also building radar decoys artificially. feeding reflections that do not exist to the participating radar.
All above is possible in very cheap way even per speed boat.
Sorry for lengthy text, I enjoyed writing it :p
One thing I was thinking now was: If they could manufacture small solenoid based Gauss capsules and fill a cluster ammunition case with it and detonate them all while swarming on top of the theater like blanketing the 1000*100 meter diameter around it while swarming the target it may produce enough EMP and Vibration to defuse the IMU and navigation on board the hellfires if any. Also it will make a lot of cluster and smokescreen for blocking radar and computer vision references. The clusters are very simple and small and may cost less than 10$. A battery operated + permanent magnet type outer shell and a solid conducting inner shell with Aluminium powder along its axis that when detonated would push the inside core as fast as possible outwards and produce immense H field. The aluminium powder affects the radar and the H affects the IMU sensors and the cluster detonation causes the vibration needed for on board IMU's to lack precision on flight. The smoke blocks sattelite vision and the IR should be countered by phosphorus decoys tailing the speed boats.
The cluster should be launched by artillery for cheap delivery and coordinated using CC4. It will end when the fake swarm ends and prepare the theater for main attack. remember the artillery barrage just needs to cover the area and no precision on hitting any but detonating at multiple heights covering the scenery. Such mechanisms can be fired from the RC boats itself maintaining a field while approaching. Everything dirt cheap to maintain the GDP ratio!
One needs to make the cartoon for it.