[talk-au] Setting up Garmin zoom level

John Henderson snowgum at gmx.com
Mon Jul 16 21:36:31 BST 2012

Hi Brett,

On 16/07/12 20:16, Brett Russell wrote:
> When navigating in the bush you often target big object so it would
> be great if peaks could appear earlier, say even fifty kilometres as
> otherwise you are navigating by looking at "blades of grass".  Also
> be good if you could set the tracks to show up earlier.  On OSM view
> the zoom relationship is pretty good but on the Garmin it is very
> poor.
> Any clues or pointers?

As far as I know, this aspect of visibility is controlled by the map,
which tells the Garmin at what resolution objects should be displayed.

To do what you want, I believe you'll need to explore the delights of
making your own custom Garmin maps (unless you can find suitable hiking
maps already made).

See: http://wiki.openstreetmap.org/wiki/Mkgmap/help/Custom_styles

This is a huge topic.  But once set up with some scripts, you can
automate the downloading of raw OSM data, and the creation of your own
custom Garmin maps (either topographic or routable).  You can also
integrate contours from other sources (although that's something I
haven't personally got around to).

To get down into the fine detail, you'll need to adjust values in the
mkgmap "points" file for:

	natural=peak [0x6616 resolution 21]

and the mkgmap "lines" file for the likes of:

	highway=path {add access = no; add foot = yes} [0x16 road_class=0
road_speed=0 resolution 20]


(an old bushwalker - old enough to have once walked the Overland Track
in summer without seeing another person for three days).

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