The murder of German hitchhiker Birgit Brauer has prompted Telecom to launch a text-message service in which people can register their movements or car details on a central database.
The Safe service was aimed at people walking late at night or getting into vehicles driven by someone they did not
know, the company said.
The body of Ms Brauer, 28, was found dumped in bush at Lucy's Gully, 17km southwest of New Plymouth, on September 20. Michael Scott Wallace, 44, has been charged with her murder.
The Safe service enables Telecom cellphone users to send a free text message to 7233 in situations they want their whereabouts, intended destination and car number plate details to be recorded.
The idea came from journalist and former hitchhiker Simon Louisson. He had thought of it several years ago and the backpacker murder appalled him so much he wrote to Telecom.
Louisson is also the father of two daughters, aged 12 and 15, who are approaching the age of going out at night and travelling independently.
"I had a fantastic experience hitch-hiking all over the world. It's a great way for young people to meet other people, and they shouldn't be put off by one particular low-life," he said.
"If someone has nasty intentions, but he knows the hitchhiker or cab passenger has taken his details and texted their whereabouts, he may be less likely to do something."
Young people should also be texting parents to let them know their whereabouts.
Telecom spokesman Sean Martin said the service was not a substitute for calling 111 in case of an emergency.
The 7233 messages were not monitored and would only be accessed following a formal approach from police.
Vodafone said it would canvass customers to see if they wanted a similar service.
Several months ago, Vodafone launched the Ice (In Case of Emergency) service, encouraging cellphone users to record their next-of-kin details on their phones.
- NZPA
Safety check
* Text 7233 (Telecom users) to record whereabouts, destination or car number plate details.
* The message is free and will be accessed by police only in the event of trouble.
* Potential users include hitch-hikers or young people out at night.
* In emergencies, still call 111.
