Iridium SBD vs. Certus 9704: Which Is Better for Remote Telemetry?
Choose between Iridium SBD and Certus 9704 by looking at payload size, reporting frequency, hardware, power, deployment length, and total airtime economics.
Compare using the deployment you actually plan to run.
Payload size, reporting interval, device count, and deployment dates can change which Iridium plan makes sense.
Use the SBD or Certus calculator before you decide.
A real payload, reporting interval, device count, and deployment window will tell you more than a generic satellite airtime example.
Start with the amount and shape of data your device sends
SBD and Certus 9704 can both serve remote telemetry, but they behave differently enough that the best choice depends on the real device workload. Small, infrequent messages may favor an SBD workflow; richer payloads and more frequent messaging may make Certus 9704 more attractive.
Compare payload size, reporting interval, minimum billable message behavior, monthly plan cost, activation, overage, power budget, hardware design, device count, and deployment duration.
When SBD is a strong fit
Iridium Short Burst Data is well suited to compact telemetry where the device sends relatively small messages: location, status, alarms, environmental samples, health metrics, or other concise sensor payloads.
When Certus 9704 becomes more attractive
Certus 9704 is designed for messaging workloads that need more flexibility than traditional short-burst telemetry. It can be a better fit when payloads grow, devices report more often, or the application needs to move richer operational data while remaining in a message-oriented satellite architecture.
Do not choose from protocol names alone
Two devices using the same network can have very different monthly costs because their reporting patterns are different. The safest way to choose is to model both networks using the payload and deployment assumptions you expect in the field.
Telemetry Station provides separate calculators for SBD and Certus so you can compare the available plan behavior before registering IMEIs or funding a deployment.
Frequently asked questions
Is Certus 9704 always cheaper than SBD?
No. The result depends on message size, frequency, plan structure, minimum billable message size, included usage, and total monthly data. Model the actual deployment rather than assuming one network is universally cheaper.
Can Telemetry Station activate both SBD and Certus devices?
Telemetry Station provides self-service workflows for supported Iridium SBD and Certus deployments, including plan selection, IMEI registration, account funding, activation, and ongoing deployment management.