TOWN OF SPRINGFIELD, Wis. -- Officials said that technology helped rescue crews locate victims who were in a pickup truck that plunged to the bottom of a quarry Wednesday night.

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Four people remain hospitalized Friday at University of Wisconsin Hospital after the truck that they were riding in plunged about 70 feet into a local quarry late Wednesday night.

The four were part of a group of six who gathered in the Yahara Materials quarry in the Town of Springfield, located east of Highway 12 near the Parmenter Street exit. The group was lighting and watching fireworks to mark the July Fourth holiday, according to Dane County investigators.

One of the other victims is now out of the hospital, but the truck's driver was killed in the crash. He was identified on Thursday as Tyler Burcalow, 22, and was pronounced dead at the scene.

Authorities said that Burcalow worked at the quarry, which is owned by his father.

Dane County authorities identified the passengers as Colman Y. Dockter, 22, of Middleton; Aric J. Hinrichs, 22, of Middleton; Brandy Bunnell, 22, of Madison; John C. Ogden, 21, of Cross Plains; and Uriy S. Kistanov, 20, of Madison. Officials said on Thursday that Dockter was in critical condition, Hinrichs was in serious condition and Bunnell, Ogden and Kistanov were in fair condition.

One of the survivors was able to get out of the truck and call for help. Although the cell phone battery died, dispatchers were able to pinpoint the location of the remote crash scene through global positioning system technology, authorities said.

The original 911 call went to Middleton police. Officials said the call came from a tower on Pleasant View Road and that there are two quarries near that tower.

When Middleton transferred the call to Dane County dispatch, the crash location could be pinpointed because of a GPS chip in the caller's cell phone, WISC-TV reported.

"In a case like this where the technology is giving an approximate location and there are two quarries nearby, again it's a combination of people taking a call and using the technology to narrow down the location," said Rich McVicar, acting director at Dane County Public Safety Communications.

McVicar said that not all wireless services use GPS technology but that all have some system that can assist emergency workers to pinpoint locations.

McVicar said he can recall about a dozen times in the last year that the technology has helped people in trouble.

Dane County officials have had the technology to pinpoint emergency calls made on cell phones for only a year, WISC-TV reported.