Another questioin that I'm sure has already been answered through discussion... But I'll ask anyways
I have a Garmin 750, is there a way to have the unit determine direction of travel so it doesn't notify me of a camera on the other side of the freeway?
With so many speed cameras going up in the Phoenix area this thing is always screaming at me!
The alerts are set by distance. If you're hitting the cameras on some of the older freeways where there is little or no median, you're going to get warned regardless of your direction of travel. If you're on one of the newer stretches of freeway where there are more lanes and a wider median, you won't be warned of the one on the other side of the road.
Thanks for the info. Is it better to save those poi's as a rate of speed alert or will setting it to alert at a distance matter at all?
Is the distance adjustable?
Yes.. When you load the poi's through the Garmin Poi Loader you can choose to have the unit alert you at a user specified distance.
I live in the Phoenix area too and know what you're talking about.
It'd be better if you'd set a 'speed' alert so you'd only be warned when you're exceeding the maximum limit.
The problem with setting a distance parameter to avoid an alert on the 'wrong' side of the freeway is that it'll affect distance you're alerted on the 'correct' side of the road too. Assume the alert latitude/longitude is set for the far side of the appropriate direction. Each lane is 12 feet wide, figure 4 lanes so a 50 foot distance setting would 'theoretically' avoid an alert on the wrong side of the road. That would also mean you'd only be 50 feet from the camera on the 'correct' side of the road before getting an alert.
Guess I'll have to live with the heart stopping alert I put on there.. Ohterwise I'll have to invest in new tires from slamming on the brakes every two miles!
(Not that I would ever exceed the posted speed limit mind you)
[rant]We just have to accept the fact that we are going to have change the name of this area from "Valley of the Sun" to "Valley of the (Radar) Gun". Because none of this is going to help anyone locate the revenuemobiles.
So you may just as well drive 40 in the left and HOV lanes, which is what all the minivans, landscaping trucks, and RVs seem to be doing anyway, so worrying about cameras appears to be moot as you can't get past any of 'em. In spite of all the cameras, anyone who gets a speeding ticket in Arizona probably deserves it just on stupidity.[/rant]
All that said, you may want to look at
http://www.poi-factory.com/node/19045 which has some discussion about customizing the POI file so that the audible alerts only fire at certain speeds, which can be even higher than the posted speed limit.
The distance of a proximity alert for a standard POI has nothing to do with the distance across the freeway width. The alerts are along the route, not radial. You control the direction by placing the coordinates 50-75 ft from the lanes you want to cover. The proximity distance can be 2500 ft and still only alert for one side of the freeway -- it's just not terribly exact, so a wide median helps.
I have an interesting local alert. The system thinks there is a 60kph speed camera - there is not. BUT - the speed limit in the area is 70kph. If I am doing 60kph or less I get just the initial warning.
If I am doing between 60 and 70kph (ie over 60kph) my Nuvi 250 gets very excited with repeated warnings until we are out of the zone. The file is a Garmin download - wonder if they will ever fix it?
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