Pros and cons of a SPOT Messenger
First, it isn't a PLB or an EPIRB and isn't designed to be used as one. It doesn't have the durability or the battery life of either in many ways and doesn't have the SART transponder function of an EPIRB.
It is a very useful device for people traveling, especially if you're in remote areas and by yourself, since it gives you a pretty good way to at least let your friends and family know you're okay and where you are.
The SPOT Messengers have evolved, but the basic feature set included:
• the ability to be tracked via a subscription service,
• send out "I am here" messages with a GPS location,
• send out "HELP" messages to trigger e-mail or text messages to pre-defined people with a pre-defined message
• and a "911" function to summon SAR help in an emergency.
EPIRBs and PLBs can now do some of these, but IMHO it is foolish to waste the batteries of an EPIRB or PLB to send an "I am here" message.
The SPOT Messengers were designed to use the "ultimate lithium" AA and AAA batteries developed by Energizer brand of batteries and gives you about 14 days of use if you're using the tracking function. If you're just using it on an ad-hoc basis, the battery life will be significantly longer, especially if you shut the unit down between uses.
The SPOT messenger tracking website does allow you to download your SPOT location reports as a GPX file, which can often be uploaded into charting/navigation or GPS software packages. This means that you can often preserve the data and use it on a blog, as I did on my blog article on the
SPOT messenger a couple years ago.
One issue I have with the SPOT messenger is that the Tracking feature only runs for 24 hours and then needs to be reset...which is a PITA... IMHO, it should run until you shut it off or the batteries die. Other than that, the SPOT is a pretty nice addition to a sailor's kit bag.