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

[Andy Robinson]

Robert Hart [mailto:Robert.Hart at BuroHappold.com] wrote:
>Sent: 23 February 2007 9:43 AM
>To: Andy Robinson; Barnett, Phillip; David Stevenson
>Cc: talk at openstreetmap.org
>Subject: RE: [OSM-talk] [OSM-dev] Do any sat-navs log?
>
>> 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.

I cycle really fast, 10m = 1 second ;^)

Cheers

Andy

>
>Rob
>
>
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