The built-in compass in CSX is good only if you hold the unit completely horizontal, so when mounted on bars (usually at angle) it reports wrong direction.
I recently got 60CSX and first tests indicate that I get 2+ days on 2600 mAh Panasonic re-chargeable batteries. The feature I really like is the ability to log track in GPX format onto microSD card, so track memory is basically unlimited and can easily log entire RTW-like trip without downloading into computer in between. There is a separate GPX log file for each day.
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