Ephemeris data is information that the Halo Collar collects from GPS satellites, including their location and timing. This data helps provide accurate GPS readings. The collar aggregates this data over time to continuously improve its tracking precision. 

The collar may need to re-sync its connection with satellites in three scenarios:

1. When you first take your collar out of the box,
2. Immediately following a firmware update
3. If the collar is turned off for an extended period of time (we recommend that you leave the collar turned on)

If your collar requires 'GPS Initialization' - or re-syncing its connection with satellites - the GPS light will blink Red once every three seconds, and you will get an in-app notification that your GPS needs to be initialized. You will see the following on your Pet Card:

To initialize your collar's GPS:

1. Take your collar outside, preferably to an area with an unobstructed view of the sky (not a lot of overhead tree cover or surrounding buildings, etc.)
2. Keep the collar outside until the GPS light starts to blink Blue, signaling an accurate GPS calibration. This process can take as little as a minute or two but may take longer in some scenarios.
   
   • We recommend that you walk around with the collar during this process, so you can see the Pet Pin adjust to your location on the My Map screen once the GPS is initialized (if the collar is idle, the Pet Pin will not move, so you can't verify GPS accuracy). That being said, the process will still work even if you simply let the collar sit outside for a few minutes. Make sure to slightly shake the collar while you are moving so its motion sensors can be triggered and send location updates back to your app.
3. Once the Blue GPS light starts to flash, your collar has once again begun to collect ephemeris data and is ready for use. Further time outdoors and continued movement will further improve GPS accuracy.

• Through the use of innovative new technology, your Halo Collar will receive satellite position data when plugged in to charge and connected to WiFi. This data will alleviate the need for you to initialize your collar's GPS often. This data will download up to 2- 3 days of advanced satellite data daily while the collar is on the charger and connected to the internet. Having this data pre-loaded on the collar is not required in order for the collar GPS to work. 
• Still, please note that it is possible that you will get an in-app initialization notice on occasion, so be familiar with the above procedure so you can act accordingly if you ever need to re-initialize. 

If you initialize your collar and you're still noticing inaccuracies:

1. Ensure the collar is on the latest firmware
   • • You can use  this article to help make sure that firmware is up to date
2. Go to your Pet Card to confirm the GPS level
   • • GPS level should be LOW if the collar is indoors
       • This is the ideal indoor GPS level- the Halo Collar is not meant to track location while indoors
       • The collar will not track in LOW level, and collar feedback will be paused 
       • Pet Pin should be showing in the last location where the GPS was in a HIGH GPS level
     • GPS level should be HIGH and UPDATING when outdoors
       • This is the level the collar should be at whenever outdoors
       • When the collar shows a HIGH GPS Level and updating all feedback on the collar will be active 
         • To track the collar on the map, the collar needs to be connected to LTE or WIFI- if not connected to either of these, the collar will not give live updates
         • Regardless of connectivity, the collar will work to keep the dog within the Safe Zone if the GPS level is HIGH and UPDATING
3. After checking the GPS level, if you see that the GPS is LOW while outdoors
   • • With collar ON dog- Check collar Fitment. The way the Halo Collar fits on your dog is crucial to its functionality. How to Fit the Halo Collar Onto My Dog. 
       • • If fitment is correct, you can try adjusting GPS levels- This allows the Collar's GPS signal level settings to be customized to work as accurately as possible on your property, ensuring that your pup receives preventions at the right times- How to Adjust My Collar’s GPS Signal Level Settings.- For assistance, feel free to contact our Live Support
     • With collar OFF dog- Take the collar outside in an open area and hand-test it. Here's how: How to Test the Collar's Accuracy by Hand. 
4. Check the collar diagnostics in your Collar Settings and view the GPS module specifically. If you receive a message stating that the GPS module is not working properly, please contact our customer support team.

If you need further assistance, our team is dedicated to resolving this matter for you. If you have any further questions or need additional assistance, please do not hesitate to contact our customer support. We are here to help!