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Old 11th Jan 2012, 15:48
  #5 (permalink)  
renard
 
Join Date: Apr 2001
Location: EGPH
Posts: 120
I have got a GPS datalogger which I use on my bicycle. After a ride, you upload the data onto your computer and you can use it to verify that you have folowed a prescribed route for certain cycling events (Audax).

The track it draws is pretty good.

The software will also give you elevation climbed, which cyclists are quite keen to know.

The results given are useless. One ride from my house, 600 feet amsl goes along a disused railway (i.e no steep grades) and then along a canal (flat) and then back.

It somehow reckons I climb 3900' in 18 miles - in reality 9 miles as it is downhill/flat all the way out.

If you export the data to mapping sftware that works out elevation gain by looking at countours, then I have climbed 794'. Not as impressive but much more realistic.

Looking at GPS altitude in the aircraft it doesn't vary hugely in cruise, but I wouldn't want to use it unless it was a dire emergency.
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