In both situation, person is in removal proceedings. Non-detained respondent has obligation to go to his court hearings and ice appointment by himself, the detained respondent will be escorted by the authority.
Nothing in this post shall be construed as a legal advice. If you need advice regarding your particular situation, please contact my office directly. This information is transferred without an intent to creat an attorney-client relationship.
If by "ICE locator" you mean the monitoring system used to track the alien, then the answer depends on whether or not the alien was released with an ankle bracelet or not. If the alien was released without the ankle bracelet, then ICE would not be able to monitor his moves.
detained aliens stay in immigration custody/detention while non detained aliens are released either on their own recognizance or after paying a bond or on electronic supervision (ISAP/ATD) sometimes referred to as "ankle bracelet". Aliens who are released from ICE custody will appear on the online detainee locator provided they have been released no longer than 60 days ago and are not juveniles.
A non-detained is when someone is not in the custody of ICE. A detained person is when someone is in custody of ICE. The ICE Detainee Locator will not provide information to those individuals who are not currently detained.