How close is close

lanason

lanason

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I been playing with my GPS in the car again and set up a route with a number of waypoints - the route actually started and finished at home.

Now two of the fileds show "TIME TO NEXT" and "DIST TO NEXT" - as I approached the first waypoint the time and distance was counting down nicely but as I passed it, it started going up and up and up.
So how does the GPS know that I have passed the first waypoint and now heading onto the next one. How close have I got to be for it to say "YEP", to itself and were off to the next one - 6 foot, 60 foot, 6 miles ???

I bet there is some stupid setting somewhere deep in its guts that decides. Now if I was walking 6 foot would be good, 60 foot in the boat might be fine and 6 miles if I was flying in a Harrier Jump jet.

I finally got home long before I had set off .........

<hr width=100% size=1>Adrian
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Taking the direction of the route to the waypoint, once you have passed the line at right angle to the route that passes through the waypoint, it will move you onto the next waypoint - even if you are ,iles away from the waypoint - its the logical thing to do! :-)

<hr width=100% size=1>Paul
 
Well, on my proper boaty GPS, you set a ring round the waypoint of say 1/4 mile. Then you have to get the boat in the ring.

<hr width=100% size=1> <font color=blue>No one can force me to come here.<font color=red> I'm a volunteer!!.<font color=blue>

Haydn
 
Mines Garmin GPS 72 - proper enuf eh

the right angle bit makes sence but the GPS doesnt seem to know that - how do I tell it ??

<hr width=100% size=1>Adrian
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Mine.s got a arrival alarm when you get there ot tells you your there,or here??? or there??

<hr width=100% size=1><A target="_blank" HREF=http://www.arweb.co.uk/argallery/stamfordian>http://www.arweb.co.uk/argallery/stamfordian</A>
 
mine has for the destination but not for the "NEXT" waypoint - unless i'm missing summat

<hr width=100% size=1>Adrian
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Ahhhh think i may have found it - in alarms "approach and arrival" was set on auto but the options are : Off, auto, Distance and time

so I'll set it and see tomorrow if it works - now set to 1 mile - should be OK for the car

<hr width=100% size=1>Adrian
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If you set just one waypoint - then as you appraoch the waypoint, when you are within the arrival alarm radius, the alrm will sound BUT this is not what you are talking aboit when you set a route.

Imagine you set a route (which must be more than one waypoint) and lets say you are well adrift and pass the first waypoint one mile to starboard - when you have passed the right angle I have explained the GPS will switch to the second point even though you were not within the arrival alarm radius - this would still happen if you were 100 miles adrift. The reason is that once this line is passed the logical route is to the next waypoint which is shorter than turning at right angles to meet the first waypoint and then heading to waypoint 2.


So there is no setting needed - what I am talking about is automatic.

<hr width=100% size=1>Paul
 
"Ahhhh think i may have found it - in alarms "approach and arrival" was set on auto but the options are : Off, auto, Distance and time"

No thats wrong and would only work if you were heading for just one wapoint (no route) or the very last waypoint in a route.

Folks are confusing arrival alarm zones with the manner in which GPS units pass you onto the next waypoint in a route.

<hr width=100% size=1>Paul
 
On mine you can set a list of waypoints into the proximity alarm screen.
If the alarm goes off you may have to press enter , and then it should jump to next waypoint in the route.
Have fun!

<hr width=100% size=1>Julie <P ID="edit"><FONT SIZE=-1>Edited by powerskipper on 12/10/2003 20:17 (server time).</FONT></P>
 
But even on yours it will jump to the next waypoint once you pass the line I have talked about - regardless of you being within the proximity zone or not - they have to work that way. Because this is a navigational matter its important to get it right. The proximity zones have nothing to do with the original post - it was about the gps jumping to the next waypoint, even though you may not be very near the first.



<hr width=100% size=1>Paul
 
The exact anser to your question:-
"How close have I got to be for it to say "YEP", to itself and were off to the next one - 6 foot, 60 foot, 6 miles ???"

You can be any distance along the line that is at 90 degrees to the route line that passes throogh the waypoint. Jumping to the next one has nothing to do with the proximity alram and that applies to all GPS units. The moment you crosss the right angle the nearest route to the next point is to go directly to it without doing a 90 degree turn to the current point.

I think there is confusion here and as its a navigational matter the point should should be clarified.

<hr width=100% size=1>Paul
 
Agree! Proximity alarms an entirely different subject. Bit scary that peeps don't know how their GPS work, when they don't use papercharts too!

Stirring! :)

<hr width=100% size=1>
 
I'm glad someone pointed that out. Surely when using a GPS the position/course displayed will be checked/plotted on a chart. Also the info gained from the GPS should be used as a check against your EP/DR/fix or plotted course from other info gained to give you your position/course.

Or am I being really old fashioned!

<hr width=100% size=1>
captain.gif
 
Thats not the way my GPS works and I would argue it is'nt safe either. With my unit, you have to get within the arrival alarm distance of the waypoint before it defaults to the next waypoint.

<hr width=100% size=1>
 
Deleted User & Power Skipper

Sorry but I am not convinced by your answer.

What you are telling me is that if you set a proximity to say 1/10th mile and pass a waypoint that is part of a route, so that the waypoint is 1 mile to starboard, your GPS will not set itself to the next waypoint (the shortest route) but will instead always point you to the first waypoint and never let you onto the second waypoint unless you come within the proximity of the the first? It would be a fairly useless system if it did this. I have Raytheon and Garmin and have looked at others ssuch as Simrad and everyone of them passes you onto the next waypoint when you crosss that right angle - what makes of plotter are you both using?




<hr width=100% size=1>Paul
 
"Now two of the fileds show "TIME TO NEXT" and "DIST TO NEXT" - as I approached the first waypoint the time and distance was counting down nicely but as I passed it, it started going up and up and up. "

Because you passed the right angle


<hr width=100% size=1>Paul
 
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