[Openstreetmap] How to do gps data logging?

[Zebedee Mason]

Am looking at buying a GPS with barometric altimeter for putting on the 
handlebars of my bicycle to record my rides and subsequently calculate 
the gradients. Say a maximum speed of 50km/h = 14 m/s and a resolution 
of 10m, then I want to be sampling about once a second. Over an 8 hour 
bike ride that comes to about 30,000 sample points.

If I read things correctly then an eTrex Vista is supposed to do about 
10,000 sample points per tracklog but comes with quite a hefty price tag 
(in the UK). Anything lower down the range will have me stopping 
periodically to save the tracklog into internal memory and start a new 
one, with which I'm sure I would get quickly bored. Riding over the same 
stretch multiple times with a lower sampling rate doesn't sound like 
much fun either.

A further constraint is that I don't own any form of portable computer 
and don't intend to cycle around with one. Given this I would be 
grateful if anyone can tell if am I correct in my analysis of Garmin, 
have I missed anything out and are there any better options?

Cheers

Zeb


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