Abstract: A system is provided that is configured to be transported, carried or worn by a user, such as a portable personal training device or sports watch. The system comprises a global navigation satellite system (GNSS) receiver arranged to obtain the location and/or speed of the user and a pedometer for counting steps made by the user. Data from the GNSS receiver is used to calibrate the pedometer each time the user is determined to travel a distance greater than a predefined distance value during a period of time in which signals obtained by the GNSS receiver meet the one or more accuracy and/or reliability criteria.

Abstract: A system is provided that is configured to be transported, carried or worn by a user, such as a portable personal training device or sports watch. The system comprises means for determining the location of the user at a plurality of times during a journey from a first location to a second location, such as a GPS receiver. The system further comprises means for determining a motion state of the user at a plurality of times during the journey. The means can include an accelerometer, and can also utilise data obtained from a GPS receiver. The system further comprises means for determining the distance travelled by the user during at least a portion of the journey using the plurality of determined locations and the plurality of determined motion states, such that the system functions as an odometer.