How long does ISM maintain sleep data in memory?

Hello,

I've noticed that if the ISM doesn't sync with my phone in the morning, the sleep data appears to be lost when the connection is reestablished in the evening. I was under the impression that the unit had enough onboard memory to maintain a record of the previous night's sleep until it was ultimately synced.

Questions:

1. Can the ISM retain data for a period of time if not synced (assume the battery is charged)?

2. If yes, how long (days?) and how much data (multiple nights' worth of sleep? Just a single night?

3. If no, how much time do I have after waking to sync before data is lost?

Thank you -

0 DoctorCool 6 months ago

Interesting. I too thought the ISM had the capability to hold on to data for several nights without losing any information. Now you've got me curious. I may see about doing a bit of an experiment to see if I can find out. Unless of course someone manages to post the answer here. Ideally someone from Garmin will know.

0 Garageguy05 6 months ago in reply to DoctorCool

Yep. Fingers crossed Garmin weighs in. I'm hoping I don't need to open an official ticket to find the answer...

0 9266177 1 month ago

I stumbled here after mine didn't sync when i woke up at 6am. For what it is worth, I was able to sync at 8pm that same evening. I thought the data was lost.

0 Garageguy05 1 month ago in reply to 9266177

Unit never consistently synced when my mobile wasn't in range. Generally, if I didn't sync in the AM, the data was lost. It also struggled to maintain a link with the phone; I had to sporadically re-add it to the app in order to restart syncing. Garmin finally agreed to replace the unit, but I haven't had time to unpack and test.