I am not sure if this is what you are looking for, but you may want to
consider a pebble.

The pebble is very hackable (c core) and I believe it has what you are
looking for.  It does require an app to load data onto the watch and
probably get data from the watch, but from what i know this wouldn't be too
hard for someone with some knowledge to get around.

Another option would be the TI Chronos - but I am not sure how good the
sensors are in this thing.

http://www.newark.com/texas-instruments/ez430-chronos-915/cc430-rf-wireless=
-watch-915mhz/dp/51R4690?ost=3D51R4690&mckv=3DzZAkNa1Z&CMP=3DKNC-GUSA-GEN-S=
HOPPING-TEXAS-INSTRUMENTS&CAGPSPN=3Dpla&gclid=3DCj0KEQjw4NmvBRCRp_yu2bzal4Y=
BEiQAWfjpJo4xzlYrD0Vu1RL3KX9EhrurmOen-4s9fwAzCSNI9hcaAq5c8P8HAQ&CAWELAID=3D=
120185550001096510


Kind Regards,

Aleksei

On 13 September 2015 at 19:45, James Cameron <quozl@laptop.org> wrote:

> G'day,
>
> I'm looking for an activity tracker (cumulative cadence-recognising
> accelerometer with battery and RF or USB) for mounting on human wrist
> or ankle, for walking or bicycling.
>
> Especially one that can be used without a handheld PC (aka phone) app.
>
> Any recommendations?
>
> --
> James Cameron
> http://quozl.linux.org.au/
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