Mounting Orientation - Hemisphere GPS V104n User Manual

Mounting Orientation

The V104n outputs heading, pitch, and roll readings regardless of the
orientation of the antennas. The primary antenna is used for position.The
primary and secondary antennas, working in conjunction, output heading,
pitch, and roll values.
Parallel Orientation: The most common installation is to orient the V104n
parallel to, and along the centerline of, the axis of the boat. This provides a
true heading. In this orientation:
• If you use a gyrocompass, you can enter a heading bias in the V104n
to calibrate the physical heading to the true heading of the vessel.
• You may need to adjust the pitch/roll output to calibrate the
measurement if the Vector is not installed in a horizontal plane.
Perpendicular Orientation: You can also install the antennas so they are
oriented perpendicular to the centerline of the boat's axis. In this orientation:
• You will need to enter a heading bias of +90° if the primary antenna
is on the starboard side of the boat and -90° if the primary antenna
is on the port side of the boat.
• You will need to configure the receiver to specify the GPS antennas
are measuring the roll axis.
• You will need to enter a roll bias to properly output the pitch and roll
values.
• You may need to adjust the pitch/roll output to calibrate the
measurement if the Vector is not installed in a horizontal plane.
V104n GPS Compass User Guide
9