How height is actually measured, written for people standing on a mountain rather than sitting in a cockpit — including the parts most apps leave out.
Air pressure becomes a height, and every way it goes wrong follows from that. Includes the three-pointer dial, why a passing front invents 160 metres of climbing, and how to correct it.
Read the guide → The words, and the surfacesElevation is the ground, altitude is you — and underneath, four different reference surfaces. One of them is worth 46 metres in this valley, and it is why two phones can both be right and disagree.
Read the guide →Or skip the reading and get the number for where you are standing.
Check my elevationMore is on the way — how elevation gain is counted and why two apps disagree about the same walk, what a GPX file is and what to do with one, and the German editions of all of it. If there is something you want explained, write and say so; the list is short enough that a good suggestion goes straight on it.