My 955 (fw 12.23) always shows lower pace (current pace, lap pace, etc) than it actually is, and what is displayed at 'autolap' intervals. For example, 955 shows 5:00 pace during run, then every 1km, by autolap, corrects it as 4:2x - 4:30 (last lap pace). I tried every GPS option (from GPS only to All+Multiband) - with the same results. Tried to switch metrics from km to miles and back - with no luck.
Currently I am trying to make rough mathematical adjustments 'on flight' but would very appreciate if anyone helps of how to just see correct pace values.