I used a SPOT device to track my progress as I hiked the trail. I would check in at the end of each day and when I arrived at each of my resupply locations. I didn’t use the tracking option which creates a bread crumb trail of your journey because it cost extra and chews through batteries. I didn’t carry my SPOT through Oregon to reduce my base weight but had it the whole way through California and Washington. I only had to change the batteries once and that was simply as a precaution through Washington. There were a number of times in bad weather and if I didn’t have a clear view of the sky that the SPOT signal failed to transmit, even though it said it had sent. You should leave the SPOT turned on for at least 30 minutes after checking in to ensure the message goes through. You can also share the link of your location with family and friends so they can check on your progress and see where you are on a map. You can set a password for this link or leave it open for all to view. The SPOT allows you to select 10 email addresses or phone numbers to send an alert to when you check in.