I'm using a Garmin 196 and I don't know how similar it is to the P3. I find it useful to have the split screen view of map and data fields - Dist Next, Speed, ETE Next, ETA Next, HSI.
Nearing destination I usually go to "full screen map" for clearer detail of the area. A problem with mine recently was that it kept switching itself off mid-flight for some reason (fine vibrations?). Strangely it has apparently cured itself of this.
I assume the P3 has similar function to the 196?