How To Install A Simrad Go7


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GO7 Chartplotter/Fishfinder installation guide

We have chosen to install a Simrad GO7 combo unit, but these instructions are applicable to most combo units. 

Products you will need

1. Before you start

Check all the contents are in the GO7 box.

Decided if you want to flush mount the unit or use the mounting bracket provided.

Decide on location of the head unit and transducer.

If your boat is over 5m long check that the transducer cable will ready your head unit. Cable extensions can be brought if needed.

If you have a hard top aluminum boat, consider fitting an external antenna to get the best possible GPS fix. Otherwise choose a location that will minimize obstruction e.g well forward on the dash board so that the signal passes through the windscreen.


2. Cables

Take the head unit power cable, identify the positive and negative wires (if unsure, consult the product manual) and cover all other exposed wires that aren’t being used with the provided cable cover or use heat shrink. 

Connect the inline 10A blade fuse which is provided.   Use a duraseal connector to connect the inline fuse wire with the positive (red) wire and seal with a heat gun. 


Attach the appropriate connectors to the positive and negative wires.  Use ring connectors so the wires are ready to be attached to the busbars.  Note that the head unit has a fuse plus an on and off switch so there is no reason to run these wires through a switch panel. 

3. Head Unit

First cut out the paper template supplied with the combo unit.  Place it on the dash and choose its best location.  You can double check using a ruler if you want it centered or offset to allow for other instruments to be installed in the future.

Use masking tape to fix the template into its exact position. 

The template shows which size drill bits you need.  Using the correct drill bits, drill the mounting holes and the pilot holes.  Enlarge the pilot holes with a whole saw drill bit so that it is ready for the jigsaw work.

Remove the paper template.  Use a pencil and ruler to draw the cutting guidelines for the jigsaw work. 

When using the jigsaw place the blade slightly inside your guidelines, so that you don’t cut too wide.

Cut all 4 sides until your hole is complete.  Use a file to smooth off any sharp edges.  Check that the head unit fits snugly into the hole.  If it doesn’t fit, look up from the rear of the dash as it’s easier to see from this angle what is causing the problem.  File off any guilty edges.

4. Transducer

Three key rules when installing a transom transducer.  It needs to be located:
1. at the stern of the boat as close to the centre as possible
2. below the waterline 
3. parallel with the waterline at trolling speed.
If possible, mount the transducer away from other accessories and away from anything which creates aeration and turbulence. 

Note: Mount a transducer with the aft edge of its underside a couple of degrees down relative to the planing surface of the hull to ensure performance at higher speeds. 

Every stern of a boat is different so as long as you follow the three key rules above you should get a good result. 

Lowrance transom transducer installation guide

Using your transducer bracket as a guide mark the fixing holes with a pencil. 
Drill holes using a cordless drill.  Duralac your stainless steel screws and fix the mounting bracket into place. 

Check the level of the transducer and make sure that you consider how the boat will be sitting and travelling in the water and what would be level to the waterline at trolling speed. Tighten all screws and bolts so that there is no movement of the bracket or transducer.

Use Sikaflex or rivet clips to run your transducer cable away from any areas where it may snag, ideally keeping the cable hard against the boat to avoid it snagging.   If the cable is in an exposed area it is recommend using protective tubing. 

Run the remaining transducer cable up the length of the boat to the head unit, cable tying as you go to keep it tidy. 

5. Finishing

Turn Battery switch off and disconnect the battery terminals.

Attach the negative wire coming from the main power cable of the head unit to the negative bus bar and connect the positive wire to the positive busbar.


Insert the power cable into the back of the head unit, and the transducer cable into the back of the head unit.  

Make sure everything is tight and secured into place. 

Reconnect battery and turn on battery switch. 

Press the power on button on the head unit to test everything is working. 

Lastly complete an in water check to make sure all functions are working correctly.