That is correct.
The amazing thing is that a GPS can read 0 mph (or kph). It is getting time/distance information from satellites that are traveling at 8700 mph (14,000 kph) and a continuously changing component of that to the receiver. They have no idea if they are moving relative to the surface of the earth other than by calculation; they can't look out the window of a car, for example, and see if the scenery is passing by.
I find it amazing that after gathering all that data it would screw up the result. My supposition is that the display is taking the output of a GPS receiver which is supplying correct information and is doing some other averaging or conversion incorrectly. It is so difficult to do the initial processing of the GPS satellite cluster transmission that it would surprise me they would make a stupid error at that point. However, someone doing a fancy display and just using the output of a GPS receiver could easily mess that part of the pipeline up.
Getting to the bottom of this would involve opening up the unit and tapping in to the output of the GPS receiver to read the messages it outputs to the rest of the display electronics. Typically this is a 10 Hz rate over a serial connection, but there may be other possibilities.
Does the display indicate the number of satellites are in view?
Last edited by MechEngr; 24th August 2025 at 18:11.
Reason: fixed the rate. 1 -> 10