Operating Instructions and Installation Instructions

ComNav Vector G2 & G2B Installation & Operation Installation

Document PN 29010078 V2.0 - 25 -

DRAFT #3 – 29 May 2009

Alignment

Adjust the orientation of the Vector G2 as necessary, and then secure it when complete:

• The four slots in the fixed base allow for several degrees of adjustment of the

orientation of the enclosure. When you have obtained the desired orientation, tighten

down the fasteners that you used in the slots securely.

• The pole base can be rotated freely on the pole, as long as the jam nut is loose.

When you have obtained the desired orientation, tighten the jam nut securely (use a

wrench!).

Caution! Use of the jam nut and a suitable flat washer are mandatory

for pole mounting. Any damage resulting from not using these to

mount the G2 will not be covered under the Warranty.

The top of the G2’s enclosure incorporates two small pointed posts and an alignment sight, to

assist you in aligning the enclosure’s orientation. To use the sight:

• look along the top of the enclosure & across the sight:

– either from the end without a post (i.e., the primary antenna end):

 then centre the other end’s post (the Long-sight shown in Figure 2, Figure 3

and Figure 11) in the length-wise groove in the Alignment sight

–

or from the m

iddle of the long side without a post:

 then centre the other edge’s post (the Short-sight, shown in the same

figures) in the width-wise groove in the Alignment sight

• the sight-line you see is the centreline of the enclosure … either length-wise when

using the Long-sight, or width-wise with the Short-sight

• adjust the direction of the enclosure’s sight-line to be parallel to the vessel’s

centreline:

– either the fore-aft or athwartships line, whichever you have chosen to use

– or perpendicular to one of those centrelines

• alignment accuracy when using the Long-sight method is approximately ± 1°

• using the Short-sight method, alignment is accurate to approximately ± 2.5°

Figure 11 – Long-sight Alignment

If you have another accurate source of heading data on your vessel, you may use the

difference between the G2’s initially-reported heading value and that of the other compass, to

correct for any bias in the G2’s alignment, by entering the difference value in the G2’s

heading bias parameter (see HBIAS on page 55 and page 58). You could also obtain a bias

value by doin

a traditional “box the compass” run.

Alternatively, you may wish to physically adjust the direction of the G2’s enclosure, by that

“other accurate compass” bias value, so that the G2 does not have any bias in its “parallel to

(or perpendicular to)” alignment.

L Using the G2’s heading bias parameter is usually the easier way!