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SECTION TWO - Installation
961 INSTALLATION MANUAL Revision A
Page 9
Choosing a system location
The 961 consists of two major parts—a processor and a control head. The 
961 supports two fully functional control heads (the second head is 
optional). The 961 system comprises the processor and control head, GPS 
receiver, optional differential receiver, controls, and the specially-coated 
display screen. 
Mounting the
control head
You can either yoke- or flush-mount the control head: Use the 
yoke-mount kit as a framework for holding the control head, or 
flush-mount the control head directly onto a flat surface of your choice. 
Using the Northstar-supplied yoke mounting kit usually provides a 
quicker and less expensive installation than a flush-mount installation. 
Regardless of the type of mount, here are a few helpful hints about where 
to mount the control head. Choose the mounting location care-
fully—before any drilling or cutting takes place. Choose a location that:
is convenient, accessible, and within comfortable reach
gives you easy access to the function keys
is where you can clearly see the display screen from your normal 
vantage point when navigating
for best display contrast, is viewed from below, looking up at the 
display screen
provides a reasonably direct path for running the required electrical 
cables
has minimal glare from windows or other bright objects (even 
though the unit has a high-contrast, anti-reflective LCD screen 
that’s specially coated and readable in direct sunlight, you’ll want to 
make the screen as visible as possible)
if flush-mounting the head, make sure you choose an area that’s 
well-ventilated; poor ventilation may cause overheating, resulting 
in potential backlighting problems
Yoke mounting
For yoke mounts, leave ample room—usually two inches—all around the 
sides and top to avoid crowding the unit. Also allow a clearance of at least 
2½ inches in the rear just for the cables and connectors. For the recom-
mended yoke-mount installation dimensions, see Figure 1, and Figure 2.
Before drilling holes, rotate the unit to the desired angle to ensure proper 
clearance for cables and operation of the unit.