[mkgmap-dev] An Observation

Mon Mar 30 13:24:17 BST 2009

I have no idea what garmin software would do, my guess is it would be 
the reverse of what we get here. Can Mkgmap guess if a map is in 
left-hand drive countries? probably by detecting roundabout direction if 
it is running clockwise.

- nyem

Mark Burton wrote:
> Hi Nyem,
> 
> Many thanks for the explanation. One question: if the change from 0x27
> to 0x0327 is applied, what effect does it have for people who drive on
> the right?
> 
> Cheers,
> 
> Mark
> 
>> Hi,
>>
>> I'm not sure if the issues have been raised here, so I'll try my best to 
>> explain. This is a problem only when the map is for left-hand drive users.
>>
>> Issue 1: Incorrect roundabout display
>>
>> http://www.mkgmap.org.uk/pipermail/mkgmap-dev/attachments/20090329/6a4b873f/roundabout-gmxt-0001.png
>> This only affect the information display on the top-left corner of my 
>> MobileXT screen - the roundabout should be clockwise not 
>> counter-clockwise. Routing correctly follows road direction.
>>
>>
>> Issue 2: Incorrect U-turn identification
>>
>> http://www.yournavigation.org/?flat=3.08947&flon=101.54504&tlat=3.08836&tlon=101.54519&v=motorcar&fast=1&layer=mapnik
>> Here is a u-turn but the driving direction will say "Turn right onto 
>> road, Turn right onto road" instead of "Perform a u-turn"
>>
>> http://www.yournavigation.org/?flat=3.08894&flon=101.54504&tlat=3.08763&tlon=101.54488&v=motorcar&fast=1&layer=mapnik
>> Here is turning left from a main road into a residential road and taking 
>> another left turn - but my Garmin incorrectly detects this as a u-turn. 
>> If my avoidance option includes avoid u-turn, routing will ignore this 
>> route.
>>
>> When I apply the change u-turns are correctly identified, and the 
>> roundabout info display correctly shows traffic direction.
>>
>> - nyem
>>
>>
>>
>> Mark Burton wrote:
>>> Hi,
>>>
>>>> Another problem solved is the left-hand traffic roundabout display issue 
>>>>   on Nuvi and MobileXT (see attached pic) 
>>>> http://malfreemaps.com/viewtopic.php?p=26047#p26047. Not sure if this 
>>>> also correctly identify "u-turn" as opposed to "turn-right, turn-right" 
>>>> instruction.
>>> Sorry, can you tell me what the problem is that gets fixed by this
>>> change?
>>>
>>> Thanks,
>>>
>>> Mark