Product specifications

• Install the Antenna Array in a horizon (as best as can be accomplished - this will

provide a foundation for performance success when the internal tilt sensor is used

to supplement Crescent Vector operation).

• Connect the primary antenna to the port marked J1000 on the Crescent Vector

OEM board, and the secondary to the port identified as J2000.

• You may choose to increase the antenna separation of the Crescent Vector to

increase the level of heading accuracy. Increasing the separation beyond the

default 0.5 m requires the use of all internal sensors (tilt sensor and gyro).

Because of the tradeoff between reliability and accuracy, we recommend no more

than a one-meter antenna separation. We have tested the Crescent Vector with a

2.0 m separation, which has yielded a 0.1° heading accuracy 95%. Use of the

Crescent Vector with larger than a 2.0 m separation is at your risk.

• Find a quiet location on the vessel from a radio frequency perspective to mount

the antennas. This location should ideally have an omni directional view of the

horizon and be mounted reasonably high (keeping in mind serviceability).

• Install the Crescent Vector board such that it is horizontal. The Crescent Vector

board has an arrow with ‘Point towards secondary antenna’ written beside it. The

board should be installed so that this arrow points along the two antennas

towards the secondary antenna. It should be aligned to the Antenna Array to

within a few degrees if possible.

• Compensate for any heading offset of the Antenna Array and Crescent Vector

OEM, in the Crescent Vector OEM configuration (the default is no compensation)

• Configure the NMEA data message output from the Crescent Vector (by default,

Port A, B and C output GGA, VTG, GSV, ZDA, HDT, and ROT at 1 Hz)

• Configure the baud rates if necessary (default is 19,200 for Port A, B and C)

• Configure the supplementary sensors if necessary (the tilt sensor operates by

default and the gyro is disabled, but it is recommended that all sensors be turned

on once installation is complete)

• Configure for your desired mode of differential operation (either SBAS, beacon, or

external corrections)

• If you are using the second dimension of attitude provided by the Crescent Vector

OEM (either roll or pitch, depending on the Antenna Array orientation), configure

the Crescent Vector OEM appropriately (the default is pitch)

• Compensate for pitch / roll error due to installation, within the Crescent Vector

configuration (the default is no compensation)

• If your application does not involve pitching or rolling of more than 10° from

horizontal, configuring the Crescent Vector for level operation will reduce startup

and reacquisition times significantly

• Configure the Crescent Vector for the correct antenna separation if not the default

0.5 m measure.

WARNING!

Use of the Crescent Vector system with the antenna separation beyond 2.0 m is entirely

at your risk. For antenna separations between 0.5 and 2.0 m, all supplemental sensors

are required in order to provide a robust heading solution. We recommend that the

antenna separation remain equal to or below 1.0 m.