Chris, I'm not sure what you mean by "I don't agree with SNH's map however. I think the areas of high and medium sensitivity are much higher".
Do you mean the map isn't suitable as a plan for windfarm location, or that their designations of sensitive areas aren't correct? As far as I can see the map is just a map of sensitive areas made up of four other maps:
Map 1 - Designated landscape and recreational interests
Map 2 - Non-designated landscape and recreational interests
Map 3 - Designated biodiversity and earth science interests
Map 4 - Non-designated biodiversity and earth science interests
It's not a suggested windfarm location map, but it is a good map on which to base a windfarm map. A margin needs drawing around the sensitive areas and windfarms excluded from the sensitive areas and margins. The width of the margin would depend on the type of the sensitive area, the visibility from the sensitive area , including range (higher viewpoint, wider margin - but the terrain of the margin might block the view and allow a narrower margin) and backdrop (if a windfarm is visible but Inverness is behind it for instance) etc etc There might need to be two or three different margins to cope with different height structures.
In a joined up world the resulting map could be used with a windspeed map to adjust the margins here and there. Margins developed in such a mechanical way could well have varying value, and if a margin of low value happened to have a high windspeed it could be traded for a valuable area that had slipped through the net.
You and I know that a blanket "no" just isn't going to work. That battle's already been lost, and nothing we've learned so far encourages us to think that the "no" policy is going to work in the future. So, yes the map is a compromise, but it's a compromise structured to give people some of what they want rather than a compromise based on luck.
John