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5.7.5.1 Off-route sensitivity and Recalculation delay
Depending on the quality of your GPS device, the GPS antenna location in the car
and the environment you are driving in, route recalculation can behave differently.
iGO may think you have departed the proposed route and perform a recalculation
even if you have not done so.
When the GPS reception is poor (e.g. driving in an urban environment with a low
sensitivity GPS), occasional wandering (called position fluctuation) of the calculated
GPS position is likely. Although iGO employs a sophisticated Lock-on-Road system
that will mostly suppress these position errors by aligning your position to the
recommended route and the road network of the map, sometimes the errors are too
large to correct.
To reduce the effect of large errors, you can increase the recalculation tolerance two
ways.
Off-route sensitivity
This is a range of relative values from 0 to 10, telling iGO how far the GPS position
should be from the recommended route before the program decides to recalculate.
Lower values make iGO insensitive to position errors; higher values will result in
quicker reactions.
Recalculation delay
This is a setting that helps suppress the effects of position fluctuation. With a few
seconds delay in recalculation even large position jumps can be survived without a
need for route recalculation.
5.7.5.2 U-turn penalty
You can fine-tune the way iGO takes U-turns into account when planning a route.
You can tell iGO how much extra distance you would travel to avoid a U-turn.
Note: This value is taken into account only if U-turns are enabled in Route
Parameters (Page ).62
5.7.5.3 Cross-border planning
By default iGO plans routes using the border crossing points. However, if you live
near the border, you can disable border crossing with this switch to remain within
one country.
5.7.5.4 Keep position on road (Lock-on-Road)
iGO is normally used for vehicle navigation, therefore Lock-on-Road will display the
position arrow precisely over roads, seamlessly correcting small GPS errors. For
pedestrian use you may consider disabling Lock-on-Road to make iGO always show
your exact position.
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