Though, keep in mind that the satellite messenger's battery is going to run lower much faster if you use it much (and paying at least a $12/mo subscription for

Though, keep in mind that the satellite messenger's battery is going to run lower much faster if you use it much (and paying at least a $12/mo subscription for it on top of the purchase price, you'll probably be pretty tempted to use it), while a PLB never runs down from use because you only ever use it in a definite emergency.