The primary difference between an ELD and an AOBRD (Automatic On-Board Recording Device) lies in functionality and regulatory compliance:

• Data Accuracy: ELDs provide more precise and standardized data.
• Real-Time Synchronization: ELDs must synchronize with a vehicle’s engine to automatically record driving time, while AOBRDs allow for some manual entries.
• Graphical Display: ELDs can display HOS logs in real time, which AOBRDs cannot.
• Compliance Standards: ELDs are designed to meet specific FMCSA technical requirements, whereas AOBRDs were less strictly regulated.

Although AOBRDs were allowed temporarily under the ELD mandate, their usage is now prohibited.