The effect of an external antenna and another chip-set(3)

Picture 4

The first thing that we remark is that the NAVI-S is aware of satellite 30, low in the SE, but does not seem to know about satellite 10, low in the NNE. As these satellites are just above or just below the horizon, this probably has no importance. The NAVI-S looks for satellite 6, much higher in the sky then the GPS76.

As all 4 results are almost identical (see hdop, pdop, vdop and Err), the only conclusion from this test, although not spectacular, is that as long as the sky is open enough and there are enough satellites in view, nothing is critical. The GPSr in front of you, with or without external antenna, or a GPSr with a SiRFstar II/LP chip-set, it does not really matter. Reception and accuracy are good.

For the next Field Condition, we will have to look for a much more covered sky, preferably in a pine forest.