Gadling

Just to clarify the difference between PLBs (Personal Locator Beacons) and the SPOT Satellite Messenger (contrary to popular belief, SPOT is NOT a PLB). A PLB is the ultimate personal rescue device, period. As such, when activated it sends a distress signal to SARSAT geosynchronous satellites which is then relayed to the AFRCC (Air Force Rescue Coordination Center) from where the closest Search and Rescue agency is dispatched. Low earth orbit satellites passing overhead use Doppler technology to determine location coordinates accurate to within 300-400 yards. PLBs equipped with a GPS receiver (most are) will transmit location coordinates with an accuracy of about 100 yards provided the necessary GPS signal is acquired (this is an important potential limitation as inclement weather conditions and tree canopy can prevent acquisition of the GPS signal).

The SPOT on the other hand has features not present in PLBs which include being able to track the movement (for an additional fee) using Google maps as well as being able to send specific pre-defined messages such as "Just Checking in" as a text message or to an e-mail address you've specified previously. As and emergency rescue device, SPOT isn't a PLB. It's primary means of providing location information relies on the successful acquisition of a GPS signal which can be spotty at best in inclement weather, under a tree canopy or in a canyon.

There are many other differences including price so if you want a device that will get you rescued (just in case) get a PLB, if you want something with tracking features allowing you to check in but not as strong of a rescue device, get SPOT. If you want it all, get both. PLBs can also be rented at PLBRentals.com for about $49/week.

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