INSTALLATION MANUAL GPS NAVIGATOR GP-90

Safety Instructions

⚠️ WARNING

Do not work inside the equipment unless totally familiar with electrical circuits. Hazardous voltage which can cause electrical shock, burn or serious injury exists inside the equipment.

Turn off the power at the mains switchboard before beginning the installation. Post a sign near the switch to indicate it should not be turned on while the equipment is being installed. Fire, electrical shock or serious injury can result if the power is left on or is applied while the equipment is being installed.

⚠️ CAUTION

Ground the display unit to prevent loss of sensitivity and mutual interference. Confirm that the power supply voltage is compatible with the voltage rating of the equipment. Connection to the wrong power supply can cause fire or equipment damage. The voltage rating appears on the label at the rear of the display unit.

Use the correct fuse. Use of a wrong fuse can cause fire or equipment damage.

Keep the following compass safe distances:

1. Equipment List

Standards

Options

2. Display Unit

The display unit can be installed with either of four methods as shown below. Refer to the outline drawing at the end of manual.

• Locate the unit away from exhaust pipes and vents.
• The mounting location should be well ventilated.
• Mount the unit where shock and vibration are minimal.
• Keep the display unit away electromagnetic field generating equipment such as motor, generator.
• Allow sufficient maintenance space and a sufficient slack in cables for maintenance and repair.

Table Top and Overhead Mounting

[Diagram: Two illustrations showing the display unit. One labeled "TABLE TOP" shows the unit placed on a flat surface. The other labeled "OVERHEAD" shows the unit mounted above. This illustrates display unit mounting methods.]

Flush mounting type F

An optional flush mount kit type F is required. For details, see outline drawing at end of manual.

Flush mounting type S

An optional flush mount kit type S is required. For details, see outline drawing at end of manual.

3. Antenna Unit

Mounting

Install the antenna unit referring to the installation diagram at end of manual. When selecting a mounting location for the antenna unit, keep in mind the following points.

• Select a location out of the radar beam. The radar beam will obstruct or prevent reception of the GPS satellite signal.
• Be sure the location offers a clean line-of-sight to satellite. Objects within line-of-sight to a satellite, for example, a mast or funnel, block reception and cause prolonged acquiring time or interruption of position fix.
• Mount the unit as high as possible. Mounting the antenna as high as possible keeps it free of water spray, which can intercept reception of GPS satellite signal, if water spray is frozen.
• The antenna unit GPA-018S must be grounded. Connect ground wire of 1.25 sq or larger (local supply) between the antenna unit and a stainless steel screw fastened to the mast.

Extending Antenna Cable Length

The standard cable is 15m long. 30m and 50m long extension cable sets are optionally available. See page 4.

Extension cable line-up

Fabricate the end of antenna cable and attach the coaxial connector. Details are shown on next page.

[Diagram: Shows three antenna units (GPA-019S, GPA-018S, GPA-017S) connected via cables to a "Conversion Cable Assy." and then to a "Connector". The diagram indicates distances like 20cm, 1m, and cable lengths like 30m or 50m. It also shows "Fabricate locally." and an arrow pointing "To display unit".]

Waterproofing the connector

Wrap connector with vulcanizing tape and then vinyl tape. Bind the tape end with cable-tie.

[Diagram: Illustrates the process of waterproofing an antenna cable connector using tape and a cable tie.]

How to attach the N-P-8DFB connector

[Diagram: A step-by-step visual guide showing how to attach an N-P-8DFB connector to a coaxial cable. It details cutting the outer sheath, armor, and inner sheath, preparing the shield, cutting the insulator and core, twisting the shield, attaching the clamp nut, gasket, and clamp, folding back the shield, cutting aluminum foil, folding back foil, exposing insulator and core, and finally inserting and securing the pin into the shell.]

4. Wiring

The figure below shows the connection of cables on rear of display unit.

⚠️ CAUTION

Ground the display unit to prevent loss of sensitivity and mutual interference.

[Diagram: Shows the rear of the display unit with connections for Antenna Unit (GPA-019S, GPA-018S, GPA-017S) via a 20cm cable, and connections for External Equipment. It also shows the FUSE 2A and INPUT 12~24 VDC terminals, with black and red wires connected to the positive and negative terminals respectively. The "Ground" terminal is also indicated.]

Grounding

The display unit contains several CPUs. While they are operating, they radiate noise, which can interfere with other radio equipment. Ground the unit as follows to prevent it.

• The grounding wire should be 1.25sq or larger.
• The grounding wire should be as short as possible.

External Equipment

The DATA1, DATA2, and DATA3 ports are used to connect an external equipment such as autopilot, remote display, navigation equipment. Refer to the interconnection diagram on page S-1 for connection of DATA1, DATA2 and DATA 3 port. The DATA4 port is used to connect NMEA equipment, IBM-PC or DGPS beacon receiver as follows;

Connection of DATA4 port

In case of RS-422 Level

[Diagram: Shows a block diagram for DATA4 port connection in RS-422 level. Pins 1-7 are labeled TD-A, TD-B, RD-A, RD-B, S-G. These are connected to "RS-422 level IBM PC Beacon Receiver NMEA equipment".]

In case of RS-232C Level

[Diagram: Shows a block diagram for DATA4 port connection in RS-232C level. Pins 1-7 are labeled RD, NC, SD, S-G. These are connected to "RS-232C level IBM PC Beacon Receiver NMEA equipment".]

NOTE: See page 15 for selection of input/output signal.

5. Initial Settings

Checking Operation

1. Turn on the GP-90.
2. Confirm that "OK" and "BEACON RCVR INSTALLED" are displayed on the self-test display.

[Diagram: Shows a self-test display output with "PROGRAM MEMORY =OK", "SRAM =OK", "Internal Battery =OK". It also shows "BEACON RCVR INSTALLED" connected to "DATA 3: DATA OUTPUT" and a note stating "Confirm that 'BEACON RCVR INSTALLED' is displayed when DGPS function is provided."]

3. Press [MENU ESC], [8] and [1]. Confirm that "BEACON OK" is displayed.

DGPS Setup

The default setting is "manual".

Automatic DGPS setup

The beacon receiver (GR-7000A) can automatically select optimum reference station by feeding GP-90's position data. If it takes more than 5 minutes to fix DGPS position at the automatic mode, switch to manual mode. Use the manual mode when an external beacon receiver has no automatic function of station selection.

1. Press [MENU ESC], [9] and [7] to display the DGPS SETUP menu.

[Diagram: Shows the "DGPS SETUP" menu screen with options for "DGPS MODE" (On/Off), "Ref. Station" (Auto/Man(ID=)), "Freq.", and "Baud Rate". It notes that "Man" options appear when "Man" is selected. Navigation keys are shown: " : Select", "ENT: Enter", "MENU: Escape".]

2. Press ↑ or ↓ to select DGPS MODE and press → to select On.
3. Press ↑ or ↓ to select Ref. Station.
4. Press → to select Auto.

Manual DGPS setup

Enter four digit ID number, frequency and baud rate of station.

1. Press [MENU ESC], [9] and [7] to display the DGPS SETUP menu.
2. Press ↑ or ↓ to select DGPS MODE and press → to select On.
3. Press ↑ or ↓ to select Ref. Station.
4. Press → to select Man.
5. Enter four digit ID number. You can clear an entry by the [CLEAR] key. If the number entered is invalid, the buzzer sounds and the message "INVALID ID" appears on the display for three seconds. If there is no ID number, press the [NU/CU ENT] key.
6. Press the [NU/CU/ENT] key.
7. Enter frequency in four digits (283.5 kHz to 325.0 kHz).
8. Press the [NU/CU ENT] key. "Baud Rate" appears in reverse video.
9. Press ↑ or ↓ to select baud rate; 25, 50, 100 or 200bps.
10. Press the [MENU ESC] key.

DGPS Operation checking

1. Press [MENU ESC] and [7].
2. Press [←] several times to display the following.

[Diagram: Shows a "DGPS INTEGRITY STATUS" screen with fields for NAME, ID, Bit Rate, Sig Strength, Health, Freq, SNR. It also shows "DGPS DATA: Good" and "BEACON STATION: Good". Below this are "STATION MESSAGE" and "MENU: Escape". Further sections include "Beacon signal status", "Reference station status", and "DGPS signal strength". Notes explain the values for signal strength (1-84) and signal to noise ratio (1-22), with advice on checking grounding, radar beam interference, and power generator noise if SNR is low.]

Input/Output Setting

The GP-90 can output navigation information to external equipment. For example, it can output position data to a radar or echo sounder for display on their display screen. You can convert a Loran Plotter to a GPS Plotter with position data from the GP-90.

Before selecting data to output, confirm what data the external equipment requires. Output necessary data only. Outputting unnecessary data can cause receiving problems at the external equipment.

Talker

All data transmitted by marine electronics equipment is prefixed with a two-character code which tells external equipment what equipment is transmitting data. This two-character code is called the talker. The GP-90 contains the talkers GP, LC and DE. Because GPS is a relatively new system some early model equipments do not recognize the GP talker name. In this case transmit data using a conventional talker, which equipment recognizes, such as Loran C.

Data format and data output availability

Output data sentence of IEC 61162-1 and NMEA 0183 Ver. 1.5/2.0.

• AAM: Waypoint arrival alarm
• APB: Autopilot sentence B (magnitude of cross track error, direction to steer, arrival alarm, bearing to waypoint) "Heading to steer to destination waypoint data" not used
• BOD: Bearing-origin to destination
• BWC: Bearing and distance to waypoint-great circle
• BWR: Bearing and distance to waypoint-rhumb line
• BWW: Bearing-waypoint to waypoint
• DTM: Datum reference
• GGA: Global positioning system (GPS) fix data (time of fix, latitude, longitude, quality indicator, number of satellites in use, DOP, altitude, geoidal separation) "age of dgps data" and "differential reference station ID" not used
• GLL: Geographic position-latitude/longitude
• GNS: GNSS fix data
• GBS: GPS satellite fault detection
• RMB: Recommended minimum navigation information cross track error, direction to steer, origin and destination waypoint ID, destination waypoint latitude and longitude, range and bearing of destination waypoint, destination closing velocity, arrival alarm
• RMC: Recommended minimum specific GPS/TRANSIT data (UTC of position fix, latitude and longitude, ground speed and course, date, magnetic variation)
• RTE: Routes
• VDR: Set and drift
• VTG: Course over ground and ground speed
• WCV: Waypoint closure velocity
• WPL: Waypoint location
• XTE: Cross-track error, measured
• ZDA: Time and date
• Rnn: Routes

Also, following NMEA 0183 Ver. 1.5 sentence is output.

• APA: Autopilot sentence "A" (magnitude of cross track error, direction to steer, arrival alarm, bearing origin to destination.

Input data sentence of NMEA 0183 Ver. 1.5/2.0

Checksum is checked if attached, and if any errors are found, the sentence becomes invalid. Talker ID is not distinguished.

• DBT: Depth below transducer
• DPT: Depth
• HDG: Heading, deviation and variation
• HDM: Heading, magnetic
• HDT: Heading, true
• MTW: Water temperature
• TLL: Target latitude and longitude
• VBW: Dual ground/water speed
• VHW: Water speed and heading.

FURUNO proprietary sentence

AGFPA: Autopilot information from FURUNO autopilot equipments.

General data

1. Input of waypoint data
2. Connect YEOMAN equipment to DATA4 port.
3. Input and output of waypoint / route data

Rate of operation

The TX rate of operation is the percentage of data output in one second, and it appears on the screen. If short intervals are assigned to many sentences, the rate of operation increases as illustrated below

[Diagram: Shows three bars labeled "TX" indicating increasing rate of operation.]

Note: Output data should be less than 100%.

When the external equipment cannot display correct data input from the GP-90, the rate of operation should be lowered. For example, set a rate of operation less than 60 % for the Temperature Indicator TI-20.

DATA 1 output setting

1. Press [MENU], [9] and [3]. The DATA 1, 3 OUTPUT SETUP menu appears.

[Diagram: Shows the "DATA 1, 3 OUTPUT SETUP" menu. Fields include "Data Fmt." (V1.5, V2.0, IEC), "Talker ID" (GP, LC, DE), and "Output Data" with numbered lines for various NMEA sentences and their intervals (e.g., AAM:00, APA:00). It also shows "DATA3. Log Pulse" options (200ppm, 400ppm). Navigation keys are shown: "ENT : Enter", "MENU : Escape". A note indicates "Settings shown here are default settings. This line appears only when LOG is selected by internal jumper wires."]

2. Press ↑ or ↓ to select Data Fmt.
3. Press ← or → to select V1.5, V2.0 or IEC.
4. Press the [ENT] key. Talker ID appears in reverse video.
5. Press ↑ or ↓ to select GP, LC or DE.
6. Press the [ENT] key.
7. Enter Tx interval for each output data sentence in line 1. Tx interval is available in 00, 01, 02, 03, 04, 05, 06, 10, 15, 20, 30, 60, and 90 sec.
8. Press the [ENT] key.
9. Enter Tx interval for each output data sentence in lines 2 through 5. Press the [ENT] key after setting each line.

In great circle navigation, BWC and WNC are output but BWR and WNR are not. In rhumb line navigation, BWR and WNR are output but BWC and WNC are not. The total data output are shown by percentage on the third line.

DATA 2 output setting

1. Press [MENU], [9] and [4]. The DATA 2 OUTPUT SETUP menu appears.

[Diagram: Shows the "DATA2 OUTPUT SETUP" menu, similar to the DATA 1 setup, with fields for "Data Fmt.", "Talker ID", and "Output Data" for lines 1-5. Navigation keys are shown: ": Select", "ENT : Enter", "MENU : Escape". A note indicates "Setting shown here are default settings."]

2. Follow the procedure for setting DATA 1 output.

DATA 3 output setting

The DATA 3 can output NMEA 0183 (V1.5/V2.0) /IEC 61162-1 data or log pulse by selecting inner jumper wires. For NMEA 0183 (V1.5/V2.0) /IEC 61162-1, the same signal of DATA 1 is output from DATA 3.

Selection of NMEA0183 or log pulse

Rate of log pulse output

500 mA Max. 50 VDC

Procedure for setting of log pulse rate

1. Press [MENU], [9] and [3].
2. Press ↑ or ↓ to select DATA 3. Log Pulse.
3. Press ← or → to select log pulse for external equipment; 200 ppm or 400 ppm.
4. Press the [ENT] key.
5. Press the [ESC] key.

Setting DATA 4 to Data Output

1. Press [MENU], [9] and [5]. The DATA 4 I/O SETUP menu appears.

[Diagram: Shows the "DATA 4 I/O SETUP" menu (1/2). Options include "DATA 4. Level" with choices for "RS232C" and "RS422", and "Data Out" with "Com." and "DGPS" options. Navigation keys are shown: ": Select", "ENT : Enter", "MENU : Escape". A note indicates "Appears only when external DGPS receiver is used."]

2. Press ↑ or ↓ to select DATA4. Level.
3. Press ← or → to select level of external equipment; RS232C or RS422.
4. Press the [ENT] key.
5. Press ↑ or ↓ to select Out.
6. Press ↓ to select to Next Page. The DATA 4 I/O SETUP <out> menu appears.

[Diagram: Shows the "DATA 4 I/O SETUP <Out> 2/2" menu. It includes "Data Fmt.", "Talker ID", and "Output Data" for lines 1-5, similar to the DATA 1 setup. Navigation keys are shown: "ENT : Enter", "MENU : Escape".]

7. Follow "DATA 1 output setting" from step 2.

Setting DATA 4 to "COM." (general data)

Waypoints and Routes data can be received from a personal computer, through the DATA 4 port.

1. Press [MENU], [9] and [5].
2. Press ↑ or ↓ to select DATA4. Level.
3. Press ← or → to select level of personal computer; RS232C or RS422.
4. Press the [ENT] key.
5. Press → to select Com.
6. Press ↓ to select To Next Page. The DATA 4 I/O SETUP <Com.> menu appears.

[Diagram: Shows the "DATA 4 I/O SETUP <Com.> 2/2" menu. Options include "Baud Rate" (e.g., 9600 bps), "Load Data" (WPT/RTE), "Command" (Stop/Start), "Save Data" (WPT/RTE), "Command" (Stop/Start). Navigation keys are shown: ": Select", "ENT: Enter", "MENU : Escape".]

7. Press ↑ or ↓ to select Baud Rate.
8. Press ← or → to select baud rate; 4800bps, 9600bps or 19200bps.
9. Press the [ENT] key.
10. Press ← or → to select WPT/RTE.
11. Press ↓ to select Command. Stop, on the same line as Command, appears in reverse video.
12. Press → to select Start. The message shown in Figure 5-8 appears.

[Diagram: Shows a confirmation message: "Loading erases current data and stops Route navigation. Are you sure to load? ENT: Yes MENU: No".]

13. Press the [ENT] key. The message shown in Figure 5-9 appears while data is being loaded.

[Diagram: Shows a loading message: "Now loading Waypoint/Route data ! MENU: Stop".]

14)Output data from the computer. When loading data is completed, the cursor shifts to Stop.

15)Press the [ESC] key.

Setting DATA 4 to DGPS

An external DGPS receiver can be connected to the DATA 4 port. Follow the procedure below to setup the GP-90 according to the specifications of the DGPS receiver.

1. Press [MENU], [9] and [5].
2. Press ↑ or ↓ to select Level.
3. Press ← or → to select level; RS232C or RS422.
4. Press the [ENT] key.
5. Press ← or → to select DGPS.
6. Press ↓ to select To Next Page.

[Diagram: Shows the "DATA 4 I/O SETUP <DGPS> 2/2" menu. Options include "First Bit" (MSB/LSB), "Parity" (EVEN/ODD/NONE), "Stop Bit" (1/2), and "Baud Rate" (4800/9600). Navigation keys are shown: ": Select", "ENT: Enter", "MENU: Escape".]

7. Press ↑ or ↓ to select First Bit.
8. Press ← or → select first bit; MSB or LSB.
9. Press ↓ to select Parity.
10. Press ← or → to select parity bit; EVEN, ODD or NONE.
11. Press ↓ to select Stop Bit.
12. Press ← or → to select stop bit; 1 or 2.
13. Press ↓ to select Baud Rate.
14. Press ← or → to select baud rate; 4800 or 9600.
15. Press the [ENT] key.
16. Press the [ESC] key.

6. Optional DGPS

Beacon Receiver Set GR-80

[Diagram: Shows a connection diagram between the GP-90 and the GR-80 Beacon Receiver via DATA4 port using RS-422. It illustrates the pin connections (TD-A, TD-B, RD-A, RD-B, GND) and cable colors. It also shows the Whip Antenna and Preamp unit connected to the GR-80. A note indicates this connection is required for L/L Auto mode of GR-80.]

When the GP-90 is connected with Beacon Receiver GR-80, do the setting as follows.

*1: Coincide with the setting of the Beacon Receiver GR-80.

Refer to page 17 for DGPS setup.

Packing Lists & Installation Materials

[Diagram: A packing list table showing Unit, Description/Code No., Q'TY, Outline, Document Name, and Other Installation Materials. Items include Display Unit, Antenna Units (GPA-019S, GPA-018S, GPA-017S), Spare Parts, FUSE, Installation Materials like Tapping Screw, Installing Spacer, Pipe, Hose Clamp, and Other Installation Materials like Antenna Cable Assy., Power Cable, Cable Assy. Notes explain code number conventions, antenna unit determination, and antenna cable availability.]

[Diagram: Another packing list table, similar to the previous one, detailing components and materials for the GP-90 and related models.]

Outline Drawings

[Diagram D-1: Outline drawing of the Furuno GP-90 Receiver Unit for desktop mounting. Shows front, side, and top views with dimensions, mounting holes, and connector labels (ANT CONNECTOR, SIG. CONNECTOR, GND TERMINAL, POWER SOURCE). Includes specifications for mass with and without beacon.]

[Diagram D-2: Outline drawing of the Furuno GP-90 Receiver Unit for flush mounting (Type S). Shows front, side, and top views with dimensions, cutout dimensions, mounting holes, and connector labels. Includes specifications for mass with and without beacon.]

[Diagram D-3: Outline drawing of the Furuno GP-90 Receiver Unit for flush mounting (Type F). Shows front, side, and top views with dimensions, cutout dimensions, mounting holes, and connector labels. Includes specifications for mass with and without beacon.]

[Diagram D-4: Diagrams illustrating antenna mounting methods and separation distances. Includes mast mounting with various antenna types (VHF/UHF Whip, MF/HF Whip, INMARSAT, GPS), stanchion/rail mounting with handrail base, and mounting on inclined surfaces using optional antenna bases. Also shows cable management and stress relief.]

[Diagram D-5: Outline drawing of the GPA-017/017S Antenna Unit. Shows top, side, and bottom views with dimensions, thread specifications, and connector details. Includes a table listing Type, Cable Length, Plug, and Mass.]

[Diagram D-6: Outline drawing of the GPA-018/018S Antenna Unit. Shows top, side, and bottom views with dimensions, thread specifications, and connector details. Includes a table listing Type, Cable Length, Plug, and Mass.]

[Diagram D-7: Outline drawing of the GPA-019/019S Antenna Unit. Shows top, side, and bottom views with dimensions, thread specifications, and connector details. Includes a table listing Type, Cable Length, Plug, and Mass.]

[Diagram D-8: Outline drawing and circuit diagram for the Furuno Rectifier PR-62. Shows front, side, and rear views with input/output terminals and internal components. Includes a diagram for changing tap connections based on supply voltage.]

Interconnection Diagram

[Diagram S-1: Interconnection Diagram for the Furuno GP-90 GPS Navigator. Illustrates connections between the Antenna Unit (GPA-017S, GPA-018S, GPA-019S), Receiver Unit (GP-90), Rectifier (PR-62), and external equipment via various data ports (DATA1, DATA2, DATA3, DATA4) and power input. Shows cable types (e.g., TNC-J-3, N-P-8DFB, 8D-FB-CV) and lengths. It also indicates connections for a Remote Event Switch (MOB switch) and external DGPS beacon receiver or PC. Notes specify cable length selection, connector fitting, menu selection, and jumper wire settings.]