[mkgmap-dev] What should be in the global index by default?

Sun May 7 14:54:48 BST 2017

Hi Gerd,

there are 2 search algorithms in Garmin devices. One uses index, second 
search near current position and probably uses data directly in img. You 
can see both versions in Mapsource. Under "Find" menu there are options 
"Find Places", which uses index and "Find Nearest Places", which doesn't.

If you start "Find Places", then you get 4 categories. I guess they 
could represent 4 different section of index. These are: cities, 
features (POIs), addresses and intersections.

Under feature you find categories and subcategories. These are device 
specific, could be different in a GPS. I think categories are dependent 
on index too, since map created by mkgmap behaves differently than 
cgpsmapper version, even if they contain the same POIs.

Search in BaseCamp is weird. I think developers got some idea to 
integrate multiple algorithms into single search. It took them years to 
get it working and it still confuses me.

Search in GPS seems to work similar to Mapsource. If you search for a 
name, then most probably it uses index. I'm not sure about search for a 
category. I think outdoor GPS starts with search near current position 
but maybe car GPS uses index.

-- 
Best regards,
Andrzej