RTK dGPS

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The idea is to use modern dGPS units - one fixed nearby and one on the glacier (rover) computing its location using data from the base station. So rather than record large volumes of data we get fixes computed onsite.

u-blox M8P

L1 only system but reasonably priced and quite well documented

C94-M8P - (docs) tests in UK with short baseline and very static stock antennas show 0.02 to 0.01m precision after about 5min relock.

piksi multi from Swift

L1 and L2 so expect higher accuracy

Rockblock Iridium unit

These will be used to transmit the location data.

need to look into onboard battery - as unit will be in sleep more a lot (20uA using sleep pin)

if using pwr header it can draw 470mA - (rather high for LiSOCs)

Batteries and power management

Plan to turn gps units off between measrements of about 5min with a fixed base station nearby.

Try Lithium ion?

http://www.large-battery.com/7-4v-10ah.html

need to evaluate the systems once running.