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Choose a tracking system by starting with the decision the monitoring must support—not by assuming one tag is best. Define where and how often you need locations, how quickly the data must arrive, how long monitoring will last, and what the team will do with the results. Then weigh those needs against the animal’s size and welfare, field access, connectivity, data capacity, budget, and approvals.
Start with the post-release question
Before comparing devices, write down what the team needs to learn after release and how that information will affect management. A project concerned with movement across a large, remote area has different requirements from one checking whether an animal remains near a release site or stays with its group.
Specify the required geographic coverage, location frequency and accuracy, and how soon a location must be available. Also decide how long monitoring should run and what evidence will count as a useful outcome. More frequent or detailed locations can improve understanding of movement and habitat use, but they do not by themselves establish every project outcome. Match the monitoring design to the question rather than collecting the most data possible.
Compare the main tracking approaches
Tracking systems differ in how they determine or record locations, how data reach the team, and how much fieldwork or later device recovery they require. Their performance depends on the particular device, species, study design, terrain, coverage, and implementation.
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| Approach | How data are obtained | Best fit and tradeoffs |
|---|---|---|
| Active VHF radio telemetry | A field team uses a compatible receiver and antenna to search for a signal and locate the animal. | Useful for local monitoring when staff can access the search area. It requires trained field effort and sufficient access to detect the signal; terrain and logistics affect detection. |
| GPS-GSM | A tag records GPS locations and transmits them over cellular networks. | Can provide frequent GPS data where cellular coverage and the tag’s design support it. Coverage, power needs, and suitable tag size constrain its use. |
| GPS with satellite transfer or satellite PTT | A device obtains locations and sends data through a satellite service. | Can support broad-area or remote monitoring without relying solely on local field searches or cellular coverage. Fix rate, location accuracy, power use, and cost vary by system. |
| Archival logger | A device stores data for later retrieval rather than routinely transmitting them to the team. | Can fit projects where later recapture or retrieval is feasible. A recovery plan is essential because stored records may not be available until the device is recovered. |
USGS’s AIMS for Wildlife page describes waterfowl GPS-GSM deployments with accuracy below 5 meters and near-real-time reporting as a specific example, not a general specification for GPS-GSM tags. The same page describes approximately ±100-meter VHF triangulation as historical practice in the 1980s; that historical figure is not a controlled comparison with current products.
Build a project-specific comparison
Once the team has defined the monitoring question, compare candidate systems against the same requirements. Request current specifications and quotes for the actual device, service, and deployment; the available sources do not establish market-wide tag prices, service costs, failure rates, or cross-species performance benchmarks.
- Location needs: Set the required geographic scale, location frequency, accuracy, and data latency. Check which of these the supplier specifies for the proposed device and conditions.
- Connectivity and recovery: Confirm whether the planned area has the cellular coverage needed for GSM transfer, whether satellite transfer is available for the deployment, or whether a logger can realistically be retrieved.
- Power and duration: Ask how the chosen fix and transmission schedule relates to expected operating life. Do not assume a battery-life figure from another species or deployment applies to this project.
- Field effort and handling: Account for the work of capturing and fitting the tag, searching for VHF signals, retrieving loggers, and maintaining equipment and staff capacity.
- Animal fit: Confirm that the device’s size, weight, and attachment method are appropriate for the target species and individual animal, and establish how possible effects will be monitored.
- Data workflow: Identify how records will be received or retrieved, checked for quality, stored, archived, and made available to the people responsible for decisions.
- Full cost and approvals: Include device and service expenses alongside field labor, transfer, data management, and analysis. Check applicable permits, institutional care requirements, and jurisdictional rules before deployment.
Plan the monitoring operation before release
Monitoring is part of the release plan, not a task to improvise after animals are moved. The IUCN elephant guidance provides a taxon-specific example of GPS/satellite and VHF collars used to monitor movement and group cohesion; it should not be treated as a general protocol for other animals.
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- Assign people and equipment. Name the staff responsible for fitting, searching or receiving data, and maintaining the monitoring workflow. Ensure they have the equipment and training required for the selected method.
- Test the end-to-end system. Check the tag, receiver or data-transfer path, and the team’s ability to access and interpret records before release. For archival devices, include retrieval in the plan.
- Set the data schedule. Decide how locations will be received or collected, who will check incoming records, where they will be stored, and who will act on them.
- Define outcomes in advance. Specify what movement patterns or other monitored results will inform management, and how the team will assess the project’s post-release objectives.
Choose attachment and weight for the animal—not by analogy
Document the selected device make and model, attachment approach, device weight, planned transmission timing, and how potential effects will be monitored. Tag fit and attachment are species- and project-specific, so examples from one animal should not be carried over without an appropriate protocol.
For birds covered by USGS Bird Banding Laboratory authorization, its 2018 auxiliary-marker guidance asks applicants to provide the electronic device make and model, attachment method and experience, monitoring for potential transmitter effects, and device weight as a percentage of body mass. It states limits of 2% for leg attachments and 3% for other attachment types in that authorization context. These figures are not universal wildlife limits and do not establish rules for other species or jurisdictions.
A USGS desert-tortoise plan describes VHF telemetry and GPS data loggers and gives examples of transmitter models, battery life, weight, and attachment materials for its tortoise methods. Those examples are not specifications to reuse for another species. Because capture and device fitting are intrusive interventions, include their biological and operational burden in the decision, and consult current care, permit, and jurisdictional requirements.
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Make data usable for management
A functioning tag is only one part of the monitoring system. Decide how records will be transferred or retrieved, checked, archived, and interpreted, and who will have access to them. Plan staff time for quality control, storage, analysis, and the ongoing work needed to turn locations into information the project can use.
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Quick Recap
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