Oceaneering C-Nav7050 User manual

C-Nav7050 User Guide
Revision 0
Revision Date: November 2020
C-Nav®Positioning Solutions
730 E. Kaliste Saloom Road
Lafayette, LA 70508 U.S.A.
oceaneering.com/cnav

C-Nav7050 User Guide
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Release Notice
This is the November 2020 release of the C-Nav7050 User Guide.
Revision History
0
11/1/2020
Initial release
R Morton
Revision
Date
Description
Author

C-Nav7050 User Guide
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Trademarks
The C-Nav logo is a trademark of Oceaneering International, Inc. Microsoft, MS-
DOS, Windows, Windows 7, and Windows 10 are trademarks of Microsoft
Corporation. All other brand names are trademarks of their respective holders.
FCC Notice
This device complies with Part 15 Subpart B Class B of the FCC Rules.
Operation is subject to the following two conditions:
1. This device may not cause harmful interference, and
2. This device must accept any interference received, including interference
that may cause undesired operation.
Disclaimer of Warranty
EXCEPT AS INDICATED IN “LIMITED WARRANTY” HEREIN, OCEANEERING
INTERNATIONAL, INC. SOFTWARE, FIRMWARE AND DOCUMENTATION
ARE PROVIDED “AS IS” AND WITHOUT EXPRESSED OR LIMITED
WARRANTY OF ANY KIND BY EITHER OCEANEERING INTERNATIONAL,
INC., OR ANYONE WHO HAS BEEN INVOLVED IN ITS CREATION,
PRODUCTION, OR DISTRIBUTION INCLUDING BUT NOT LIMITED TO THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
PARTICULAR PURPOSE. THE ENTIRE RISK, AS TO THE QUALITY AND
PERFORMANCE OF THE OCEANEERING INTERNATIONAL, INC.
HARDWARE, SOFTWARE, FIRMWARE AND DOCUMENTATION, IS WITH
YOU. SOME STATES DO NOT ALLOW THE EXCLUSION OF IMPLIED
WARRANTIES, SO THE ABOVE EXCLUSION MAY NOT APPLY TO YOU.
Limitation of Liability
IN NO EVENT WILL OCEANEERING INTERNATIONAL, INC., OR ANY
PERSON INVOLVED IN THE CREATION, PRODUCTION, OR DISTRIBUTION
OF THE OCEANEERING INTERNATIONAL, INC. SOFTWARE, HARDWARE,
FIRMWARE AND DOCUMENTATION BE LIABLE TO YOU ON ACCOUNT OF
ANY CLAIM FOR ANY DAMAGES, INCLUDING ANY LOST PROFITS, LOST
SAVINGS, OR OTHER SPECIAL, INCIDENTAL, CONSEQUENTIAL, OR
EXEMPLARY DAMAGES, INCLUDING BUT NOT LIMITED TO ANY DAMAGES
ASSESSED AGAINST OR PAID BY YOU TO ANY THIRD PARTY, RISING OUT
OF THE USE, LIABILITY TO USE, QUALITY OR PERFORMANCE OF SUCH
OCEANEERING INTERNATIONAL, INC. SOFTWARE, HARDWARE, AND
DOCUMENTATION, EVEN IF OCEANEERING INTERNATIONAL, INC., OR
ANY SUCH PERSON OR ENTITY HAS BEEN ADVISED OF THE POSSIBILITY
OF DAMAGES, OR FOR ANY CLAIM BY ANY OTHER PARTY. SOME STATES

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DO NOT ALLOW THE LIMITATION OR EXCLUSION OF LIABILITY FOR
INCIDENTAL OR CONSEQUENTIAL DAMAGES SO, THE ABOVE
LIMITATIONS MAY NOT APPLY TO YOU.
Use of this Document
This User Guide is intended to be used by someone familiar with the concepts
of GNSS augmentation hardware installation and rack mounted equipment in a
marine environment. Revisions to this User Guide can be obtained on our
website www.oceaneering.com/cnav or by contacting C-Nav Support:
[email protected]

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Table of Contents
C-Nav7050 User Guide.........................................................................................1
Trademarks.......................................................................................................3
FCC Notice........................................................................................................3
Disclaimer of Warranty......................................................................................3
Limitation of Liability..........................................................................................3
Use of this Document........................................................................................4
Table of Contents..................................................................................................5
List of Figures .......................................................................................................6
List of Tables ........................................................................................................6
Manual Organization.........................................................................................7
Manual Conventions..........................................................................................7
Section 1 - Overview.............................................................................................9
Introduction .......................................................................................................9
Supplied Equipment........................................................................................10
Optional Equipment.........................................................................................10
Section 2 –Principles of Operation.....................................................................11
UHF Radio Modules........................................................................................11
Control Micro...................................................................................................12
IALA Radio Module .........................................................................................12
Auxiliary Input..................................................................................................12
Fallback Switch ...............................................................................................12
Dual Outputs ...................................................................................................12
Power Supply..................................................................................................13
Section 3 –Specifications...................................................................................14
UHF Modules ..................................................................................................14
Power Requirements...................................................................................14
Type Certification.........................................................................................14
Section 4 –Installation.........................................................................................16
Rack Installation..............................................................................................16
Installation of Antennas...................................................................................17
Determining Proper Antenna Placement.........................................................17
Antenna Installation.........................................................................................17
Coaxial Cable Installation................................................................................18

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Interconnection Diagram .................................................................................19
Section 5 - Operation..........................................................................................20
Appendix A - Petrobras UHF ..............................................................................22
Channels with Frequencies.................................................................................22
Appendix B - ADL RXO UHF Programming Procedures.....................................23
Appendix C - IALA Module..................................................................................26
List of Figures
Figure 1: C-Nav7050 Front View...........................................................................9
Figure 2: C-Nav7050 Block Diagram ..................................................................11
Figure 3: C-Nav7050 Rear Panel........................................................................16
Figure 4: Supplied Antennas...............................................................................17
Figure 5: C-Nav7050 Interconnection Diagram...................................................19
Figure 6: C-Nav7050 Front Panel.......................................................................20
Figure 7: Receiving Data ....................................................................................20
Figure 8: Not Receiving Data..............................................................................21
Figure 9: Connect to ADL Radio Window ...........................................................23
Figure 10: Frequency Configuration Window......................................................24
Figure 11: Action Overwrite Window...................................................................25
Figure 12: Reading Configuration Window .........................................................25
Figure 13: Successful Radio Configuration.........................................................26
List of Tables
Table 1: Supplied Equipment..............................................................................10
Table 2: Optional Equipment ..............................................................................10
Table 3: Petrobras DGNSS UHF Channels and Frequencies.............................22

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Manual Organization
This section describes how the manual is laid out. It gives one or two sentence
descriptions about each major section.
Section 1 - Overview (Page 9) gives a brief overview of the purpose of this
document.
Section 2 –Principles of Operation (Page 11) provides guidance on how the
C-Nav7050 works.
Section 3 –Specifications (Page 14) gives technical specifications for the
C-Nav7050.
Section 4 –Installation (Page 16) gives the installation guidelines for the
C-Nav7050.
Section 5 - Operation (Page 20) provides guidance on operating the C-Nav7050.
Appendix A - Petrobras UHF (Page 22) provides the list of channels and
frequencies used in Annex V.
Appendix B - ADL RXO UHF Programming Procedures (Page 23) provides
instructions to the user on how to program an ADL RXO UHF module.
Appendix C - IALA Module (Page 26) provides information on the IALA module.
Manual Conventions
Arial font is used for plain text in this document.
Arial italic font is used for settings names.
“Arial quoted” font is used for settings values.
Arial Bold font is used for button names.
Arial Bold Italic font is used for menu items.
Arial Blue font is used for cross-references.
Arial Blue Underline font is used for hyperlinks.
Arial red italic is used for typed commands.
Arial Bold font size 10 is used for captions.

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ARIAL BLACK ALL-CAPS font is used for port connection names.
This symbol means Reader Be Careful. It indicates a caution,
care, and/or safety situation. The user might do something that
could result in equipment damage or loss of data.
This symbol means Danger. You are in a situation that could
cause bodily injury. Before you work on any equipment, be aware
of the hazards involved with electrical and RF circuitry and be
familiar with standard practices for preventing accidents.
Important notes are displayed in shaded text boxes.
Simple file content is displayed in Courier New Black font in a text box.
Please note:
Such note boxes display important information that should not be ignored.
#Sample File
Version 0.1

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Section 1 - Overview
Introduction
The C-Nav7050 is designed to select primary and secondary dGNSS
corrections, and to automatically switch between them. The complete assembly
is designed to meet Petrobras Annex V requirements.
Annex V requires that RTCM104 correctors from several sources be interfaced
to the GNSS receivers. Since the receiver has only a single RTCM104 input this
selection must be done externally.
There are three sources of RTCM104 corrections available, one is from a
system of UHF transmitters located on offshore platforms, one from shore
located IALA beacon transmitters and a third from an auxiliary source. In some
locations, more than one UHF station can be received. It is also required to be
able to switch from one UHF source to another. The user can select any of the
sources as primary and another as secondary.
Table 1 shows a list of supplied equipment for the C-Nav7050. Tables 2 shows
a list of optional equipment. The optional equipment will have already been
installed by qualified C-Nav technicians. Note that the C-Nav7050 can supply
correction to two GNSS receivers at the same time. These can be the same or
different types.
Figure 1: C-Nav7050 Front View

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Supplied Equipment
1
C-Nav7050 1U Rack Mount Unit w/ IALA/Dual UHF
(P/N CNV7050RM1U19B)
2
6ft DC Power Supply Cable
w/ Neutrik XLR Plug
3
USB Thumb Drive
(P/N 7CNG002-0)
Table 1: Supplied Equipment
Optional Equipment
1
A31 Antenna, GPS L1 & Beacon
(P/N CNVHEM940-2088-000)
2
12" Antenna Pole
(P/N CNVWES534610)
3
UHF Antenna, 460-470MHz
(P/N CNVMAXMFB4605
4
UHF Antenna Mounting Kit
(P/N CNVMAXMMK4)
5
6ft Serial Cable DB9 Male-Female
(P/N CNVQVSC317-06)
6
C-Nav7000/7050 12VDC PSU Kit
(P/N CNV7000-PSU-12V-K)
Table 2: Optional Equipment

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Section 2 –Principles of Operation
This section provides guidance on how the C-Nav7050 works. A block diagram
of the C-Nav7050 is shown in Figure 2 (Page 11) and a description of each
component in the C-Nav7050.
Figure 2: C-Nav7050 Block Diagram
UHF Radio Modules
Each UHF radio module is pre-programmed with the list of current Petrobras
frequencies; a port on the back panel enables these frequencies to be updated.
The Channel (frequency) used by the radio is set by a combined display/switch
on the front panel. This can be set to a specific channel or requested to scan the
available channels for data. Data reception is indicated by turning the display
background from red to green. A manual front panel selection switch determines
which of the two UHF data output will be used. Note that this can be set to an
inactive channel and this will still be the sampled channel even if data is present
on the other receiver.

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Control Micro
The control microprocessor is connected to both UHF modules and is capable
of sending and confirming commands to change the current channel. The
current channel number is shown on a front panel combined display / switch
unit. The processor can also perform a scan of all programmed channels and
select the one with the best signal to noise ratio. Frequency selection and
scanning are thus possible without connection to an external PC.
IALA Radio Module
The IALA radio module can be configured via a port on the back panel. It is
normally set to auto scan for the highest signal strength. The output from the
IALA receiver is passed to the fallback switch. See Appendix C - IALA Module
(Page 26) for further information.
Auxiliary Input
In addition to the two UHF and one IALA sources it is also possible to use
corrections from an external system via a back panel serial port. These could be
derived from a PPP corrected receiver or be broadcast from a local RTCM base.
There is hardware present to support the future option of having the auxiliary
source be an Ethernet connection. A Lantronix X-Port module converts the
Ethernet data to serial. When supported in a future release, the choice of serial
or Ethernet will be mad by a switch on the back of the unit. At this time, the
switch should always be in the “serial” position.
Fallback Switch
The fallback switch examines the output of the Primary Source for data and if
data is absent for a period of time the fallback switch output changes to the
Secondary correction source. The sample period can be adjusted by an internal
control. Should Primary source data be detected then the corrections outputs
will switch back to the Primary source.
Dual Outputs
The data stream selected by the fallback switch is output by two opto-isolated
RS- 232 ports. There are two RTCM104 outputs located on the rear panel of the
C-Nav7050.

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Power Supply
The rack is powered by an external 12V DC power source, normally from a dual
redundant power supply. As a default during assembly, the input source provides
power to all the modules. The unit is protected by a fuse on the back panel.

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Section 3 –Specifications
This section covers the C-Nav7050 specifications, including modules.
UHF Modules
Power Requirements
Input:
3.3 V DC to 5.0 V DC + / ‐ 0.1 VDC
During RX:
Radio Specifications
0.5 W @ 3.3 V DC; 0.7 W @ 5.0 VDC
Frequency Band:
430‐470 MHz
Frequency Control:
Synthesized 12.5 kHz tuning resolution
Frequency Stability:
+/‐ 1 PPM
Channel Spacing:
12.5/25 kHz (user‐selectable)
Sensitivity:
‐110 dBm BER = 1 x 10‐5
Adjacent Channel Selectivity:
> 55 dB
Type Certification
Certified for operation in the U.S., Europe, Australia and Canada
FCC, IC, EU, NZ, Australia ETS300‐113‐2
Link Rate / Modulation
4FSK:
9600, 19,200 bps
GMSK:
4800, 8000, 9600, 16,000, 19,200 bps
Link Protocols:
Transparent EOT/EOC, Transparent FST,
Packet‐Switched, Trimble®, SATEL®
Forward Error Correction:
IALA Beacon Receiver
Radio
Yes
Channels:
2-channel parallel tracking
Frequency Range:
283.5 - 325.0 kHz
Channel Spacing:
500 Hz

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MSK Bit Rate:
50, 100 and 200 bps
Operating Modes:
Manual, automatic and database
Cold Start Time:
< 1 minute typical
Reacquisition Time:
< 2 seconds typical
Demodulation:
Minimum shift key (MSK)
Sensitivity:
2.5 microvolts/meter for 6 dB SNR @ 200 bps
Out of Band Rejection:
60 dB < 204 kHz and > 404 kHz
Spurious Response:
< -55 dB (0.1 MHz to 1.6 MHz)
Ripple (in-band):
3 dB
Dynamic Range:
100 dB
Frequency Offset:
+/- 8 Hz (~ 27 ppm)
Adjacent Channel Rejection:
61 dB +/- 1 dB @ frequency center +/- 400 Hz
Antenna Input Impedance:
50 Ohms
Decoding:
RTCM 6/8
Frequency Selection:
Manual or offset
Serial Ports:
2 full-duplex
Interface Level:
HCMOS, tracks input voltage
Data Port Baud Rate:
4800, 9600, 19200, 38400 and 57600 baud
Corrections Output Protocol:
RTCM SC-104
Data input / Output Format:
C-Nav7050
NMEA 0183
Voltage:
12V DC regulated, 60 W
UHF #1 Antenna:
TNC
UHF #2 Antenna:
TNC
IALA Antenna:
TNC
Auxiliary Input
Serial DB9, Ethernet RJ45
RTCM104 Dual Outputs:
DCE DB9 female tx out pin 2 (back panel)
UHF Configure:
DCE DB9 female back panel
IALA Configure:
DCE DB9 female back panel

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Section 4 –Installation
This section provides guidance on hardware installation. Figure 3 (Page 16)
shows the rear panel of the C-Nav7050.
Figure 3: C-Nav7050 Rear Panel
Please note: Prior to commencing any installation, discuss proposed mounting
locations / methods and cable routes with those involved to ensure all parties are
aware of the work to be done and the risks involved.
Rack Installation
Refer to Figure 1 for the steps below:
1) If a 19” rack has not been provided, find a suitable rack on board the vessel
to mount the 1U (1.75”) tall C-Nav7050.
2) Secure the outer sliding rails to the rack.
3) If there are no front rack nuts already on the rack, use the nuts provided with
the C-Nav7050.
4) Slide the C-Nav7050 onto the rails, ensuring that the C-Nav7050 is secured
onto the outer rails.
5) Connect the IALA antenna cable to the TNC receptacle labeled “IALA” (if
this option is installed). See Installation of Antennas (Page 17)
6) Connect UHF antenna cables (if this option is installed). See Installation of
Antennas (Page 17)
7) Connect a serial cable from the RTCM104 Out port(s) to each device that is
receiving the RTCM104 corrections data.
8) Connect the XLR plug from the power supply cable (or the optional power
supply kit P/N CNV7050PS-OPT) to the power socket labeled “12V DC”.
9) Slide the rack back out, ensuring that there is enough slack for the cables
that are connected to the back of the C-Nav7050. Once you have the
necessary slack, dress up the cables.
10) Place the cover back on top of the C-Nav7050. Secure the six Phillips-head
screws on top and the seventh (also a Phillips-head) screw in the rear.

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11) Slide the C-Nav7050 back into the rack. Secure the C-Nav7050 front panel
with the existing screws.
Installation of Antennas
Always wear appropriate protective equipment, including a certified fall
arrestor harness and hardhat when working at heights to prevent injury to
personnel, or death. Prior to commencing any work on the mast, ensure
that all radar systems are switched off and isolated.
If the C-Nav7050has either theIALA and/or the UHF option installed,it willcome
with the antennas mentioned in Figure 4 (Page 17).
Figure 4: Supplied Antennas
Determining Proper Antenna Placement
UHF and Beacon antennas may be placed along handrails with a clear view
horizontally as the UHF and Beacon signals are land-based, rather than the
space-based GNSS and SBAS signals.
Antenna Installation
Once the antenna location has been determined based on the aforementioned
criteria, mount the antenna onto an antenna-mounting pole via the antenna
mounting pole adaptor. This should be done on deck prior to climbing the mast
as mounting the antenna aloft poses potential risks to personnel and equipment
due to possible dropped object hazards.
IALA Antenna
UHF Antenna

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Install the antenna with an antenna-mounting pole in the predetermined location.
The pipe can either be welded to the mast for a more permanent installation or
secured using stainless steel hose clamps.
Coaxial Cable Installation
Proper installation of coaxial cables is important to ensure successful
communication between the antenna and sensor.
When choosing a cable route for coaxial cable, consider the following:
Avoid running coaxial cable across, or parallel to power cables and high-power
RF cables.
1) Ensure that the cable route is free of sharp edges or places where the cable
could become pinched, kinked, sliced or damaged in any way.
2) Determine the manufacturers’ specifications for the coaxial cable in use. This
should include impedance, diameter, attenuation in dB/100 ft and dB/100 m
for the frequencies used, and velocity of propagation.
3) Ensure the cable does not exceed the recommended minimum bend radius
suggested by the manufacturer. LMR400 has a bend radius of 1”
(installation) and 4” (repeated).
4) Ensure there is sufficient space at the cable entry point to the bulkhead as
to not damage the connector during installation.
5) Measure the length of the cable route and determine the acceptable cable
length in relation to attenuation loss at the frequencies in use.
Please Note: Prior to connecting the coaxial antenna cable to the antenna,
ensure that all connections are free of dirt and other debris. Apply silicone
grease to the connector threads and wipe off any excess, ensure not to get any
lubricant on the contact. Connect the coaxial cable and hand-tighten firmly. Wrap
the connection with self-amalgamating tape or rubber tape and then with vinyl
tape. Cover the taped area with Scotchkote® to prevent water ingress.
6) Slacken the coaxial cable and tape firmly to the antenna-mounting pole. This
will prevent any undue strain on the cable connector and antenna.
7) With the cable connected to the antenna, create a service loop to account
for future re-terminations and run the cable down the mast, securing with zip
ties every 2 or 3 feet. Carefully lay the cable along the chosen route to further
detect any potential kinks, bends or spots where the cable may become
damaged.

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8) Secure the cable along the cable route with tape or zip ties and place a label
at the sensor end of the cable for identification purposes.
9) Connect the coaxial cable to the sensor. Ensure that any slack in the cable
is neatly stowed and that the minimum bend radius is not exceed during this
process.
Interconnection Diagram
The following diagram see Figure 5 (Page 19) shows the interconnection from
the C-Nav7050 to the various antennas and data connections.
Figure 5: C-Nav7050 Interconnection Diagram

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Section 5 - Operation
This section provides guidance on operating the C-Nav7050. Figure 6 (Page 20)
shows the front panel of the C-Nav7050 with its buttons, switches and indicators.
Figure 6: C-Nav7050 Front Panel
Refer to Figure 6 (Page 20) for the following from left to right:
1) ON/OFF Pushing this button turns the UHF and IALA receiver modules on; this
button will illuminate green. Pushing this button again turns the UHF and IALA
receiver modules off; the lamp is extinguished.
2) Channel Select Screen Keys: These allow the user to select the appropriate
channel for each of the two UHF receivers. When the proper UHF Receiver is
selected, the user can either advance to a known channel or scanto a receiving
channel. Channel selection is performed by:
a. Press the Screen Key in ½ second intervals to advance the channel
manually (channel numbers only increase). An amber background on the
Screen Key denotes that the channel is in a manual change state.
b. To scan a channel, press and hold the Screen Key for 5 seconds and
release. The receiver will search for the channel that is receiving data by
staying at that channel for 5 seconds before moving up to next channel if
no data has been received.
c. If a channel is receiving data, the background of the Screen Key will
illuminate green as seen in Figure 7 (Page 20).
Figure 7: Receiving Data