Abstract: Embodiments of the present disclosure are directed to, among other things, monitoring a user device to determine whether a user associated with the device is safe. In some examples, a user (which may be referred to herein as an “initiator” establishes a device monitoring session (which may be referred to herein as “session”) with a user, or a group of users, so that the user(s) are notified either when the initiator has safely ended the device monitoring session or receives access to session data that was collected during the session. In some configurations, the session can be handed off from a first user device that is currently active to a different user device. Instead of the first user device always being the device that interacts with the server, a different first user device may be selected as the active device to interact with the server.

Abstract: Some embodiments described in this disclosure are directed to one or more electronic devices that display a plurality of user interfaces corresponding to communication regarding a check in interaction. Some embodiments described in this disclosure are directed to initiating a communication. Some embodiments described in this disclosure are directed towards receiving a communication.

Abstract: An apparatus includes a global navigation satellite system antenna, a global navigation satellite system receiver, a camera, and a processor. The mobile global navigation satellite system receiver produces a set of carrier-phase measurements from a global navigation satellite system. The camera produces an image. The processor determines an absolute position and an absolute attitude of the apparatus solely from three or more sets of data and a rough estimate of the absolute position of the apparatus without any prior association of visual features with known coordinates. Each set of data includes the image and the set of carrier-phase measurements. In addition, the processor uses either a precise orbit and clock data for the global navigation satellite system or another set of carrier-phase measurements from another global navigation satellite system antenna at a known location in each set of data.