Bike computers with altimeter

Altimeter

— sensor to determine the current altitude above sea level. Altitude can be determined by two main methods: barometer and GPS (see relevant paragraphs). In the first case, the pressure difference between the reference and current altitude is determined; in the second, a database is used about the height of the terrain with certain coordinates. The height designation format can also be defined: in some models, it is indicated relative to sea level; in others, it is relative to a conditional zero point specified by the user. Anyway, the information from the altimeter can be useful for assessing the elevation changes during the trip.