B&G Deckman - Manual (Page 62)

Special chart views
3.35
positive, South/West as negative) followed by OK. The number beside
the cursor changes to a ‘2’ and you repeat the above process (possibly
twice more).
Note. You are still able to use the zoom in/out tools to increase
accuracy.
Once you have completed geo-referencing (a dialog will pop up telling
you when this is the case), Deckman operates as normal, except that the
only ‘chart’ you use is the image you have chosen.
To exit this feature and return to normal charting, select
menu>charts>use image as chart followed by Cancel.
Warp image
This function allows you to manipulate your chart so that a great circle
route is changed from being curved (as usual in Deckman) to being a
straight line. This is particularly useful in a long race (and especially
with the ‘Competitors’ feature – see page Chapter 10), as it allows you
to get a proper idea of who is ahead/behind with respect to a certain
waypoint or the finish.
For example, you could convert the image shown in Figure 6.15 to that
in Figure 6.16, in which the great circle route from Land’s End to New
York is shown straight.
Select menu>chart>warp image and you will be presented with a
dialog reminding you how this feature operates; click OK. You must
then select two points on the display – the first will be shown at the top
of the screen and is the centre of the projection while the second will be
shown directly below it. Before you select the points, hit the grid
options button (shown left) at the top of the display to choose what grid
lines and spacing you want to have displayed on the warped image: you
can choose to have the grid centred on different points with different
meridian and parallel spacing:
Off No grid
North pole Grid based on the North pole; will be the
same as normal lat/long grid