yetp295143 wrote an answer about Casio PRW2500R-1 Triple Sensor Altimeter Watch on April 23, 2013
The altimeter is accurate enough for hiking but not for mountaineering. The altimeter readings will 'drift' a bit as the barometric pressure moves, this is especially noticeable in the mornings b/c the elevation will have changed even though you've been sleeping. The Core's altimeter is more accurate and much better at eliminating the drift. The Core's altimeter logs and graphs are superior as well. If you need an ABC watch for vertical aspirations you'll probably be happier with a Core or Vector or Casio G-Shock Riseman.