[Cheburashka]

All you need is an apartment that overlooks the canal, a camera, and a copy of Jane's Fighting Ships.

Another way to find out is to have someone on the payroll at the Suez Canal Authority.

In short, this is hardly something that is a secret.

[Jewbacca]

“All you need is an apartment that overlooks the canal, a camera, and a copy of Jane’s Fighting Ships.”

Don’t even need that. There is a website that logs the who, what, when, and where of Suez crossings in real time:

http://www.lethsuez.com/