Gezgin project starts before Siper project, and if even Siper is in trial test, why should Gezgin not be ready.
SIper goes from point A to B, and the hard part is at B while engaging. This is already achieved earlier with Hisar missiles.
Gezgin goes from A to B where the entire route is the challenge, the missile's mission computer should process all the data and follow its path, do terrain hugging, sea skinng if required, re routing, using terrain based navigation ( an advanced, cutting edge type) that Tubitak is developing. It can partially be built on top of SOM but the longer the range gets, the harder its gets for the engagement.
Sage could easily slap a TJ, a large fuel tank, a mock-up EO and fire the missile at 1000 km at a predesignated target with GPS GPS guidance, video editing and explosives placed inside the target than the missile itself, are meant to ingite when the missile arrives at the location than sensing the distance, like some countries does and shows off, but that's not how TAF does the stuff.
