| Feature | Blue Logger | Earthmate LT-40 | Earthmate BT-20 | Earthmate PN-20 |
| Power | Battery- life 8 hours Car and wall adaptors included |
USB power- no batteries needed | USB powered or Li-On battery | Li-On battery or 4 AA batteries |
| Connection to computer | Bluetooth Only | USB Cable | USB or Bluetooth | USB Cable |
| Memory on device | Yes- logging for 50,000 points | No | No | Internal- 75MB, room for 2 GB SD card |
| NMEA 2.0-compliant 12-channel receiver | Yes | NMEA compliant 16-channel | Yes | Yes |
| Chip set | SiRF starIIe/LP low-power GPS | STMicroelectronics new high- sensitivity Teseo chipset featuring DeLorme ConstantLock technologies | Low-power baseband and RF chip set (RF chip based on the ultra-low-power silicon-germanium BiCMOS process) | STMicroelectronics chip technology with SiGE front-end and DeLorme firmware |
| Raw data logging (ephemeris) | Yes | No | No | No |
| LED indicator | Yes | Yes | Yes | Color Screen |