ALASKA PLB PROGRAM
Since 1994, the State of Alaska
has been utilizing 406 MHz Personal Locator Beacons to help protect people
from the hazards of the Arctic. Many
people must live, work or travel through harsh, remote regions of the state
where communications are extremely limited. Prior to the PLB program, most people in need of rescue had to rely
on themselves. Needless to say, in such an unforgiving climate they often
perished. The wilderness of Alaska
has swallowed up many a traveller never to be
heard from again. The PLB program is helping to
put an end to this.
Here's how it works: When activated, an Alaska
PLB transmits a digitally coded signal on the
406.025 MHz frequency. This signal is received by a COSPAS,
SARSAT or GOES satellite and relayed to a ground
station. The ground station calculates the PLB
location and transmits the information to the US
Mission Control
Center. The USMCC recognizes these specially coded beacons as Alaska
PLBs and transmits a distress message directly to
the Alaska Rescue
Coordination Center
(AKRCC) at Fort
Richardson just
north of Anchorage.
The AKRCC then uses state, local or federal assetts to conduct the rescue.
Lets look at two fictitious scenarios.
1982 SCENARIO
A native hunter leaves Wainwright, AK enroute
to the village of Atkusuk. He's
traveling by snow mobile and the trip should take about 4 hours. He
thoroughly prepares for the trip and is well equipped. A brief check of the
weather reveals that a storm is due to hit later that night, well after his
expected arrival. He leaves a trip plan with a friend and departs. Halfway
there, his snow mobile hits a hidden crevasse and flips. He is tossed onto
the rock hard ice and suffers a broken leg. The snow mobile has a bent skid
and won't run. He gathers his supplies and assesses his situation. Unable
to travel on his broken leg, he erects a makeshift shelter. He's on the
treeless tundra so there is no wood for a fire. He does have a small
camping stove and uses it for warmth. That night, the storm rolls in. White
out conditions exist. Forty knot winds and below
zero temperatures buffett the hunter. He is now
overdue in Atkusuk and a search party is launched
for him. Unfortunately, they are turned back by the storm. During the short
daylight period of the next day they search for him unsuccessfully.
Although they know he is somewhere between Wainwright and Atkusuk, they are still searching an area of hundreds
of square miles. The next day the weather has cleared enough to launch an
aerial seach, but unfortunately the blowing snow
has covered all traces of the hunter and snow mobile. After two more days
the search is called off.
2002 SCENARIO
O.K. Fast forward to 2002. Another hunter prepares to depart on the
same trip. This time, prior to his departure, he rents a PLB and files his trip report with North
Slope Borough Search and Rescue Department in Barrow.
During the trip his snow mobile briefly turns into an airplane and he
suffers the same fate. This time however, he reaches into his parka and
activates his PLB. Two minutes later, the USMCC receives an "unlocated"
alert relayed through the GOES-9 satellite and transmits it to the AKRCC. North Slope
Borough is then contacted. A brief check of their records shows who the PLB is checked out to and what his trip plan is. NSB rolls their Bell
214ST helicopter out of the hangar and prepares for launch. Twenty minutes
after the PLB is activated SARSAT-4 comes
streaking across the sky and pinpoints the PLB
location to within a mile. The helicopter blades are just starting to spin
when the pilot is handed the position still hot off the printer from the USMCC. The weather has deteriorated and visibility is
getting poor. Once in the area, the helicopter acquires the homing signal
transmitted by the PLB on 121.5 MHz and quickly
locates the hunter. He is transported back to Barrow where his broken leg
is set and put in a cast. The next day, he's home with his family
recuperating in front of a warm fire.
Alaska
PLB Statistics
Number of PLB
Saves in 2001: 54
False
Alarms: 1
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