Yes, that is correct. If an object is located at a particular position on both radar and visually then it would constitute evidence that there is actually a physical object there. Maybe you could point me to a particular sighting where this is the case? As far as I remember from when we were discussing these cases you mention, that kind of evidence could not be confirmed to exist?
"About 2 minutes later the plane was about 7 miles north of Christchurch it entered a thin layer of cloud. Shortly after that it climbed through the top of the cloud at about 3,000 ft. Immediately the air crew and Crockett could see a very bright light ahead and about 30o to the right, i.e., northeast of them (see Figure 6). Actually, they saw two lights, one above the other, the upper being brighter. (The lower may have been a reflection in cloud or the ocean.) The captain turned on the weather radar in the mapping mode (M. E. L. Co., EL90; vertical fan beam 40 to 150 down; 3 sec sweep cycle; ranges: 20, 50, 150 nm) and immediately picked up a strong target in the direction of the light at a distance of about 18 nm." (A HISTORY OF THE NEW ZEALAND SIGHTINGS OF DECEMBER 31, 1978 - document can be accessed under NEW ZEALAND SIGHTINGS at http://brumac.8k.com/
But this is not the only radar/visual case... there are many more of those... rather, it is the only radar/visual/photographic case (because the light was also filmed by a news crew aboard the plane)! For example:
"For the next 10 minutes the plane flew in a straight line, continually climbing. According to Startup, who had the best view of the radar screen (which was at his left), the radar target initially moved radially inward (i.e. at a constant angle of about 30o to the right) to a distance on the order of 8 to 10 nm. Startup’s observation indicates that the object was traveling a bit faster than the aircraft. Then it slowly dropped back to the right, finally leaving the radar screen at the limit of its sweep (about 60o to the right). The exact time that it disappeared at the right of the radar is not known. However, it was probably at about 0225. At about 0226 (estimated time) Fogarty recorded the following statement: “We must be about 30 miles out of Christchurch ...according to Bill Startup, it came as close as 10 miles to us.” At about the same time (point 25 in Figure 6) Bob Guard reported to Wellington that the plane was about 32 nm from Christchurch at about 11,500 ft and that there was “a great big target sitting at 3:00 to us position about 12 nm away.”
During this time Crockett filmed this light using his 100 mm zoom lens. In order to be certain that he obtained images he slowed the frame rate from the normal 24 per second to 10 per second (this would more than double the exposure of each frame). Crockett started filming from his middle seat but, within a minute or so of first seeing the light Crockett got out of his seat and crouched behind the copilot. At one time, to document where the film was taken, he unzoomed to show both the UFO and a small, dimly lit meter that is under the right side window" (same reference as above)
During this time Crockett filmed this light using his 100 mm zoom lens. In order to be certain that he obtained images he slowed the frame rate from the normal 24 per second to 10 per second (this would more than double the exposure of each frame). Crockett started filming from his middle seat but, within a minute or so of first seeing the light Crockett got out of his seat and crouched behind the copilot. At one time, to document where the film was taken, he unzoomed to show both the UFO and a small, dimly lit meter that is under the right side window" (same reference as above)