Holox

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BT-321

Holox BT-321
Description receiver
GNSS 32 channels,
Memory Flash: .
Display 3 leds
Connectivity bluetooth
Batteries internal like Nokia
Features
Emblem-question.svg Addresses Emblem-question.svg POIs
Emblem-question.svg Mass Storage mode Emblem-question.svg Waterproof
Website review with photo
Notes

rebadged BT74R made by the Telemax Technology Corp



BT-541

Holox BT-541
Description receiver
GNSS 54 channels, (agps)
Memory Flash: .
Integrated motion detector
Connectivity bluetooth
Features
Emblem-question.svg Addresses Emblem-question.svg POIs
Emblem-question.svg Mass Storage mode Emblem-question.svg Waterproof
Notes

The Holox BT541 uses the Skytraq Venus 521 chipset which supports AGPS. Skytraq provide a free AGPS download application for Symbian and Windows. Time to lock, and typical accuracy are very good when AGPS is used (can be a bit tempramental without it). Early firmware versions had problems with track drift (firmware is upgradeable, but difficult to find the latest version). The BT541 has a motion detector (sounds like a ball bearing in a box) that allows the device to go into a low power mode when not moving. This can give a battery life of many days depending on usage.