[mkgmap-dev] documentation of new option in branch

Mon Nov 4 13:58:13 GMT 2019

Hi all,

I think the work on the branch is almost done.
Attached is a patch to add documentation for the new option. 
Please help to improve it:

--check-routing-island-len=NUM
	Routing islands are small road networks which are not connected to other 
	roads. Typical case is a footway that is not connected to the main road 
	network. These islands can cause problems if you try to calculate a route
	and Garmin selects a point on the island as a start. It will fail to 
	calulate the route even if a major road is only a few steps away.
	When calculating the NOD data mkgmap detects the islands. The option
	--check-routing-island-len=NUM can be used to tell mkgmap that islands with 
	a total length below NUM meters should not be written to NOD. The effect is 
	that the corresponding roads are visible as usual but they are not 
	routable.
	A negative value for NUM means that mkgmap skips the island check.

ciao
Gerd
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