Purchased a descent t1 a little while ago everything seemed fine, covid hit and didnt dive for a while, 2021
start of 2022 started diving again
noticed there was a firmware update after changing the dead battery.
since then it has been OVERESTIMATING my actual bars remaining
when i empty the tank it still shows 27 bar even though it should read 0
checked with another SPG and its overestimating by ~ 27 bars.
numerous other people seem to have similar issues see
link
https://scubaboard.com/community/threads/new-garmin-mk2i-t1-problem.612961/
it seems to read incorrectly if the battery dies or possibly the new firmware update.
this needs to be rectified by Garmin, currently im awaiting a response from the garmin support australia. they have sent me a RMA link.