[OSM-talk] [OSM-dev] Do any sat-navs log?

[Robert Hart]

> Can anyone comment on the running time for the latest colour units in
the
> dark?

I don't use it with the backlight on continually, but the thing takes
NiMH and they last more than long enough for it not to be an issue. 

My Garmin automatically switches from "daytime colouring" to a much
clearer in the dark "nighttime colouring". It does this at "sunset", but
I find this a little late sometimes.
 
> Older Garmin units and those without any on-board storage card are
> generally
> limited to 10,000 trackpoints. So if ideally mapping at 1 sec interval
> they
> normally give you about 3 hours logging time ( a few points here and
there
> are not recorded hence usually a bit longer than the theoretical 2.78
> hours.)

It makes much more sense to me to set logging to 10m intervals. 10,000
points is then 100km, which is much more than I could hope to map in a
day.

10m is about the limit of accuracy you can count on from a GPS (although
they are sometimes much better) and gives uniformly spaced points along
a road.

Rob


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