Re: Route algorithms: MapSource - V - 2610
From: John (dadkalb_at_yahoo.com)
Date: 11/27/04
- Next message: BuddhaOK: "OT - MGRS Maps"
- Previous message: Randy: "Re: Which one?"
- In reply to: Reg: "Route algorithms: MapSource - V - 2610"
- Next in thread: Ivor Jones: "Re: Route algorithms: MapSource - V - 2610"
- Reply: Ivor Jones: "Re: Route algorithms: MapSource - V - 2610"
- Messages sorted by: [ date ] [ thread ]
Date: 27 Nov 2004 07:20:11 -0800
"Reg" <news@g4ens.fsnet.co.uk> wrote in message news:<co8d7r$37c$2@newsg3.svr.pol.co.uk>...
> I am having problems with the route algorithms in both MapSource
> 5.2/ECN 6.00 and my 2610, V-3.50; or is it the mapping data sets?
>
> I am experienced with GPSrs, as the 2610 is my third Garmin having
> bought a 75 in July 1996 and connected with Psions & wintels for
> moving map and waypoint etc management. I've also been in the PC
> business for 25, before I retired, and have sold commercial programs
> that I have designed and programmed. So I'm not a newby!
>
> This week I produced 3 routes on my laptop for a day's three legged
> driving. On the first route from home to the first destination, I
> entered a via, to force MapSource to take a different route to avoid a
> known traffic congested road at that time of day. The main part of
> the route was to the east and at the via changed to a s-w direction.
>
> On approaching the via point, I noticed that the route purple line
> branched into two lines. I followed the indicated route, which I knew
> quite well, without difficulty, but the other purple line was
> straight.
>
> I soon realised that I would be late arriving, having found that the
> indicated arrival time has been quite good.
>
> As I got closer to my destination, I saw that the straight line went
> to the destination, but the arrival time was very late and I realised
> that I was on time. At the destination, the route navigation
> continued, probably back in a straight line to the via point. I
> assumed that when I added the via point I had left it after my
> destination. But on returning home and looking at the route with
> MapSource, I had not made any error.
>
> Has anyone seen this before?
>
> I also noticed as I left home that the 2610 wanted me to take a few
> narrow roads before joining the main road a few miles away. This
> would add an extra few miles to the journey rather than using the
> close main road by the shortest distance and with wider roads. I have
> seen this many times and just took my normal route, so got a
> 'recalculating' message.
>
> As I proceeded along the main road the 2610 kept telling me to turn
> left or right off the main road. Now why does this happen? (see my
> set options below)
>
> The main road is shorter and faster and I have not set any road
> 'avoids'. I have found this odd behaviour many times and has caused
> me to loose confidence in it's ability to provide good routes.
>
> So on the third route, getting closer to home, I decided to follow the
> given route to see which way it took me. As I left the main trunk
> road, I would normally travel on one main very straight road for 8.9
> miles (using MapSource) and then turn off for another 0.5 mile to
> home.
>
> I was sent on a twisting route along narrow single tack roads much of
> the time. A distance of 14.5 miles. I have the OS 1:25,000 map of
> this area which I know very well, but I was sent along single track
> roads that I've never used before. Fortunately I drive a Land Rover
> 4x4. At many junctions I knew of a shorter and therefore faster way
> home but continued to follow the indicated navigation.
>
> Back home I checked the routes planned in MapSource and uploaded to
> the 2610. The strange route I was sent on by the 2610, was not the
> same as uploaded. This had only one 'diversion' off the main road.
> The route followed was not recalculated, so why does the 2610 change a
> route calculated on MapSource.
>
> I can accept that the algorithm used by the 2610 is different to the
> algorithm in MapSource, especially as the preferences are completely
> different in each case.
>
> I have also found that I am often directed onto unsurfaced roads that
> are sometimes not legal roads for vehicles - I have a number of years
> of experience with British Rights of Way and their legal use by
> vehicles and know the history of many of these local rights of way.
>
> I've also in the past been sent along 3 sides of a square of roads
> rather than just using a single side of that square. Directing me
> into a residential area rather than staying on the main road.
>
> I use custom, best route, major roads 10 - prefer, medium 4, minor 1-
> avoid; on the 2610. I use faster time, car/motorcycle, avoid road
> tolls, speeds 58,58,40,30,20 mph in MapSource.
>
> The algorithms or map data must have major errors. I am well aware of
> the fact that data sets have numerous errors in the road information,
> but this is much more than I've noticed in using computerised mapping
> data sets for over 8 years.
>
> Anyone any thoughts on solving these types of problems. I am on a
> number of lists and too many folk are reporting similar problems.
>
> Reg.
I have discovered that when you plan a route on the PC with via's and
then download them to the 2610 you should have the 2610 recalculate
the route before you start out. I believe that will correct your
problem.
John
- Next message: BuddhaOK: "OT - MGRS Maps"
- Previous message: Randy: "Re: Which one?"
- In reply to: Reg: "Route algorithms: MapSource - V - 2610"
- Next in thread: Ivor Jones: "Re: Route algorithms: MapSource - V - 2610"
- Reply: Ivor Jones: "Re: Route algorithms: MapSource - V - 2610"
- Messages sorted by: [ date ] [ thread ]
Relevant Pages
|
