Using GPS trackers On-Site

References and experiences using GPS trackers for live tracking of long-distance sports events.

Most types of GPS trackers basically operate with the three main components:

1. GPS module: Determines the device's location.

2. GSM modem: Sends all data such as location, battery level, etc. via mobile network to the RACEMAP.

3. Memory: If the device is unable to establish a TCP connection with RACEMAP, no data can be sent, even if the GPS module is working perfectlyy. In this case, the data is stored in the device’s memory until a connection is re-established.

In RACEMAP tracker management system:

• The CON (Connection) column shows the duration since when the device established a TCP connection to RACMEAP respectively since when the socket was closed.

• The LOCATION column provides the duration of the most recent known location and the status of the GPS module.

Status of GSM modem and GPS module in the tracker dashboard

For example, during a trail run with poor reception - such as between the 30K and 38K marks - the tracker may temporarily lose its connection. During this period, real-time data won't be transmitted to RACEMAP but kept in memory. However, once the device reconnects, it will upload the stored data, filling in gaps in the race playback, so all data will be available in the event replay after a short delay.

You can see this relationship very well in the track chart.