What is CEP?

[Linton]

i saw this mentioned in relation to submarine operations and wondered what it meant.Does anybody have any idea?

[SeaQueen]

i saw this mentioned in relation to submarine operations and wondered what it meant.Does anybody have any idea?

My suspicion is that it might be circular error probability.

If you're dropping munitions on a target, be it howitzer shells, ballistic missiles, laser guided bombs or whatever, the positioning of the actual locations of impact follows a bivariate normal distribution centered on the aimpoint. In the case of weapons that land more or less vertically on their target, the bivariate normal distribution is symmetric.

In that case, CEP is defined as the circle in which that bivariate normal equal to 0.50. That means that on average, 50% of the ordinance aimed at a given point will fall within a circle with a radius equal to the CEP inscribed around the target.

Does this help?

[Henson]

Contact Evaluation Plot.

It's a 360 degree time vs bearing plot of all organic contacts.

[Bellman]

A) Circle of equal probability. (CEP)

Quote from Delta 1V use of MIRVS ( multiple independently targeted re-entry vehicles) SS-N-27 Skiff (RSM-5 Makeyev)
The missile uses stellar inertial guidance to provide a circle of equal probability (CEP) of 500m.

''The CEP value is a measure of the accuracy of strike on the target and is the radius of the circle within which half the strikes will impact.'' Naval-Technology.Com.

And:

B) Circular Error of Probability.

''The UK is believed to have purchased 58 x Trident 2D-5 missile bodies from the United States and the range of the missile is believed to be in excess of 9,000 km with a CEP (Circular Error of Probability) of about 100 metres. It is believed that in UK service the Trident II D5 carry eight warheads per missile.'' Royal Navy Site.

And:

C) Contact Evaluation Plot.

'Referring to the so-called Contact Evaluation Plot — a pencil-and-paper graphing of local ships' positions — Mr. Hammerschmidt said: ''He ceased this updating of the CEP because of the number of civilians present."The CEP gives officers and crew a constantly refreshed picture of the submarine's location relative to other ships. It is used as a supplement to electronic displays and periscope sweeps.' The Greeneville Inquiry.

Given a number of meanings the interpretation of the abreviation will be context sensitive.

[Linton]

Thank you all .I think in this case it is the contact evaluation plot.Now I just have to remember where I saw it!!

[Linton]

next question,does anybody have a picture of one?

[Dr.Sid]

I guess DW's nav map or FFG's TMA station must be something just like that.

[Linton]

I was hoping for a picture of a real one!

[Linton]

Whilst surfing i came across this page.It includes a few non-classified basic seamanship courses.
https://www.cnet.navy.mil/sobt/web/index.html

[Henson]

I can't find one online, and I don't have any screen captures stored that I can show you.

I tried, I'm sorry. It's a typical line graph with time on the Y axis and bearing on the X axis. Each contact typically has its own color, and the marks for that contact are connected to represent bearing rate. It's basically a cleaned up waterfall display with lower granularity.

[micky1up]

i spent the better part of my early career ploting the CEP that and RBROTSARC's

i can take a picutre of one and send it or if you give me an address i could sent you a basic course book on CEP and BFP and manual TMA



colours on the plot blue =ownships course and merchant vessels red =warships and subs green =fishing vessels also the are different symbols for each sensor