OK, maybe I am asking too much of this nifty machine. Is it possible for a custom POI alert to be activated depending on the direction you are headed ?
I have set some speed zones for my route to the office. For some, I want them when headed south but not when encountered heading north (i.e. leaving the zone rather than entering it)
Move the points by 100 feet...
The unit can do it - but unfortunately, Garmin have not given us the means to configure it. (Garmin's own 'Safety Camera Database' is supplied as a ready-built .gpi file and contains directional alerts). My guess at the moment, is that it is actually configured as "a set of points" you have to pass through in order to trigger the alert. I've not yet managed to prove that though.
The suggestion about moving the location of the POI - might work under certain circumstances.
Why would that work ?
In general, the POI has to be on the road/route you are on - but because roads don't have a 'width', there is margin of error allowed, which seems to be about 75'. So - for a 'divided highway', for example - one carriageway might still be within 75' of a misplaced POI, whereas the other might not. It would be a bit trial-and-error though!
One thing to bear in mind:
We tend to visualise the map as containing the exact parameters of a road, as some sort of smooth, flowing line. We think of our position as being some sort of laser-precision spot on that road.
In practice, it's the other way round. The road is just a series of precise points, joined by straight lines of no actual defined width. Our position at any one time, is a 'blob' of uncertainty of (say) 25' radius. Hence the need for this 75' margin of error. That's my thinking, anyway
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