The effect of an external antenna and another chip-set(1)

In this test we will compare the performance of 3 systems under different field conditions. The systems are:
-a Garmin GPS 76
-a Garmin GPS 76 with external Mighty Mouse II active antenna
-a Falcom NAVI-S Smart antenna with a SiRFstar II/LP chip-set

Field Condition 1: half open sky.

To the North of our position was a tall building at only 5m distance, thus blocking satellites in the North. All around were trees, blocking the sight lower than 45 degrees above the horizon. In this winter period some satellites came through the branches, now without leaves. A low, but dense tree to the South blocked satellites in that direction.

For the first screen-shot we carried the GPS 76 as any-one does, when walking: at stomach height, 45 degrees up. We were faced North, building in front.

Picture 1

For the second picture, we simply turned 180 degrees, so facing South. GPSr still in exactly the same position in front of us.