When in battery mode, a device's GPS antenna will wake up a set time before each transmission to obtain a GPS fix. In challenging conditions, or where visibility of the sky is limited, it may be required to increase the Early Wakeup time to allow the GPS to get a better fix on your position.
The Early Wakeup time ranges from the default 20 seconds to 4 minutes. Naturally, a long Early Wakeup time uses more battery than a short one.
All devices transmit ‘on the minute’ - so for example, if set to hourly transmissions, devices will try to transmit at :00 past the hour, if set to 5-minute transmissions it will try to transmit at :00, :15, :30, :45 etc.
Early Wakeup only applies to devices running on battery power. When connected to an external power source, a device will keep its GPS chip and Iridium modem powered on at all times.
All devices require a certain quality of GPS fixes before they're allowed to transmit data. GPS Quality defines whether to attempt a 2D or 3D GPS fix. A 3D fix generally has more accurate altitude and horizontal data, but requires more GPS satellites to be in view. 2D fixes are used by default.
The GPS Fixes setting defines the number of consecutive good fixes that are required before a GPS fix is accepted and transmitted. The default number is 5 fixes.
When running on battery power, the GPS will, by default, turn on only during the Early Wakeup period. In some situations though, especially when travelling at speed, you may want an instant GPS fix for your manual report.
The GPS Hot setting controls whether the GPS chip is permanently on during battery-only operation. This mode will use up more battery power.
GPS Hot on Battery
- You can set GPS Hot while running on battery power or in Limited Power mode.
Updated over 2 years ago