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5 Setting up the Receiver
58 SPSx51 Modular GPS Receivers User Guide
Installing the receiver
Select a location at which all of the following conditions are met:
• the receiver is not exposed to temperature extremes
• the receiver is not exposed to moisture extremes (such as rain, snow, water
blasters, or wash systems)
• the receiver is protected from mechanical damage
• you can connect and disconnect cables without placing undue stress on them
Mounting the antennas
You must install each antenna at the correct location. Poor or incorrect placement can
influence accuracy and reliability.
Ideally, mount the two antennas as far apart as possible and at about the same height
on the structure. Mount the antennas fore and aft along the vessel centerline or on a
line that is at a known orientation to the centerline. For best results, rotate each
antenna so that all antennas in the array point in the same direction. Always mount an
antenna at a location that ensures a good view of the sky.
Follow these guidelines to select the antenna location:
• Choose an area with a clear view of the sky. The antenna must be above any
metallic objects.
• Do not mount the antenna close to stays, electrical cables, metal masts, or other
antennas.
• Do not mount the antenna near a transmitting antenna, a radar array, or near
satellite communication equipment.
• Avoid areas with high vibration, excessive heat, electrical interference, and
strong magnetic fields.
Use a 5/8"×11" stainless steel bolt to mount each of the antennas. There is a threaded
bolt hole in the base of the antenna.
Configuring the receiver pair
One of the receivers must be nominated as a Heading unit. The other receiver is
nominated as a Moving Base unit. For this configuration to work, you must use the
Marine Heading cable (P/N 57169-10).
To set up the Heading unit:
1. From the Home screen, press
L twice. The Mode screen appears.