3. Quick Introduction
3.1 Instrument Setup
The instrument setup needs to be stable (consider also wind!) and reproducible (if repeat measurements
from a given position are foreseen). The standard setup of the GPRI-2 is on the supplied heavy duty
Leica tripod. However it can also be mounted on permanent pier or other structure. In any case there
must be sufficient room for the instrument to rotate (about 2.5 meters).
Figure 1: GPRI-II fully assembled. Instrument is aligned at 0
deg. azimuth position.
3.1.1 Leica heavy-duty tripod
Installation of the tripod is the first step in setting up the GPRI2. The tripod legs should be initially
fully retracted. Take the tripod out of the canvas transport bag and take out the 3 stainless steel rods.
1. Install the stainless steel support rods to the tripod to maintain the legs at a fixed 30 degree
angle. These rods fit into the attachments at the bottom of each leg. The end of the rod is shaped
to fit into the slots on the attachment points. A small locking arm on each attachment point must
