Zumo User Forums

Different Route Behaviour - If the XT has recalculated the route - eg After Skip
A comparison of Saved and Imported Routes

In some circumstances the nature of the route seems to change. It behaves less like a normal route where navigating to the next point is the priority and it seems to start behaving like a track that has been converted to a trip - with no route points except start and finish. For these 'track-trips', when getting the rider back onto the route, the priority seems to be is to navigate to the closest point of the remaining route.

Exactly when this change happens is difficult to pin down. It sometimes happens if the XT has recalculated the entire route - for example if avoidances have changed. In my tests it always happens if at any time I have skipped a route point - the whole route is recalculated - still visiting all via and shaping points - but from then on, 'closest point' seems to be the target rather than 'next route point'. - But it only happens with imported routes.

In the following tests I am comparing the behaviour of the same route in different circumstances. Saved Route vs Imported Route; Original route vs recalculated route.

Pic 1 - A Typical Route - Demo The bike is located at a roundabout. The plotted route takes the second exit as indicate by the magenta line and the white arrow. The route passes through a shaping point at a cafe in the small village.

I decide not to visit the cafe, so I take the 3rd exit which is a 3-lane by-pass - the green road - A65 - on the screen shot. The second shaping point is located after the point where the village road and the by-pass meet.

U-turns are permitted for these illustrations - but the by-pass is a fast 3-lane road. The XT knows this and it will not request a U-turn here.

A Via Point at the top right is badly positioned in the middle of a field. This will be part of a later test.

Pic 2 - 'Saved' Route - Missed Shaping Point

I have just taken the the third exit at the roundabout. The XT immediately recalculates the route to the next junction and heads me back to the shaping point at the cafe in the village. It will then do a U-turn and take me to the road I have just left and then to the next shaping point on the A65.

A detailed description of all of these behaviours is given at the bottom of the page.

Direct link to the Video Page for the example in Pic 1 is here

Pic 3 - Imported Route - Missed Shaping Point

After Skip was pressed, the XT recalculated the entire route - although there is no visible difference in the roads that it has chosen. However, the behaviour of the routing is now different. The screen shot was taken with the bike in the same position as in Pic 2. The route has recalculated, but because I have ignored the route to the shaping point - the shaping point has been completely removed from the route.

A detailed description of all of these behaviours is given at the bottom of the page.

Direct link to the Video Page for the example in Pic 3 is here

Pic 4 - Saved Route - Ignoring a Mis-Placed Via Point

All Zumos will try to take you to Via Points locations - even if there is no road. It will navigate on roads as close as possible and then plot a straight line (sometimes dotted) and issue an instruction like (say) 'Navigate Off Road'.

But what else can it do - that's where the Via Point is placed. Via Points are traditionally - 'must visit' locations.

A detailed description of all of these behaviours is given at the bottom of the page.

Direct link to the Video Page for the example in Pic 4 is here

Pic 6 - Imported Route - Missed Via Point - Skip Pressed Earlier

This is the same situation as above - Pic 5 - identical circumstances, except that I skipped a point earlier in the route, so the route was recalculated. The route now shows different behaviour:

• Within 5 seconds of ignoring the route to the Via Point, the screen changed to that in Pic 6.
• No Info. No Request to Skip.
• The route ahead is now a bright magenta - so it is the current section.
• The magenta line behind me has disappeared (compare Pics 2 and 3). It is as if the XT has calculated a new route from my current position through the remaining route points.
• The Via Point flag has been removed from the route

A detailed description of all of these behaviours is given at the bottom of the page.

Direct link to the Video Page for the example in Pic 6 is here

The behaviours that are decribed on this page can be seen in videos available from the Contents page - Section 20.

Direct link to the Video Page is here