Kannad is a top manufacturer of PLB's and ELT's. They make everything from the small personal locators to the mega-bucks versions used in aviation so you can be confident of their quality and their ability to work when you need them to. I personally own one of their PLB's as well as an ELB.
No matter which PLB you decide to buy, do some groundwork and ask about the cost of battery replacement. Unfortunately, for most PLB'S the present cost of battery renewal is close to the cost of initial purchase. Basically this means that these units are pretty much a throw-away item when the battery life expires. That's fine if you're happy to shell out 4 or 5 large notes every 7 or 8 years... but I struggle with that concept.
In respect to operating frequency - Yes, 406 is what you need. If it also transmits on 121.5 then even better but it's not necessary. I noticed one company was marketing a PLB that transmitted on 121.5 for a few seconds every 5 minutes but I feel that could be confusing to a searching helicopter and possibly hinder efforts to find you in mountainous terrain. A good 406 PLB and a strong light-source is a far better bet.
Why the light-source? Because searching for lost or injured people can actually be easier to do at night. Night-vision goggles can pick up even a weak light source from several kilometers away. Assuming the rescuers are equipped with them of course.
In terms of the response time, don't expect to hear a helicopter hovering over you within minutes. When a beacon is activated nothing happens until a satellite passes overhead and picks up your signal. If you're in Auckland that might be within a few minutes but if you're laying at the bottom of a steep gut in Fiordland where the only satellite "visible" to the PLB passes overhead once every hour, then you could be waiting a while. I understand that the rescue coordinators are only alerted after "confirmation" of activation... that means on the first pass of the satellite people just sit up and pay attention, but nothing happens until the second satellite confirms the activation is still present. After that people start running around waving their hands and making phone calls. First call is to your nominated number... maybe the wife or employer? Then to the second nominated number if the first doesn't answer. After finding out you're really out in the hills, not sitting by the TV at home... then and probably only then, they push the panic button. Add the time to get a team together, equip a helicopter for a rescue mission, brief the team and get airborne... 3 hours is a realistic period of time you'll be laid up in a freezing cold gut suffering from excruciating pain. My brief to my son when demonstrating how to use the PLB was to expect help the following morning, soon after daybreak. Anything earlier than that would be a godsend.
Good luck with the shopping and I trust you'll never have the misfortune to use it in desperation.
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