Diff GPS values without moving GPS mouse

[Georg]

Hello

when i check the GPS Values like speed, lat,lot and so on with a timer i get different values without moving the GPS mouse. Is it a problem of my mouse or is it a generell problem. How can i fix it?

p.e.

sek speed
1 0
2 4
3 2
4 6
5 1

Georg

[Erel]

You can check the raw data coming from the GPS.
Instead of passing Serial.InputString to the GPS object save it to a file or a multiline textbox and check the values.
The GPS library just parses the NMEA strings.