Big Sur Ventana/SilverPeak Trailmap

Gaia screenshot

(click for larger view)

Many, but not all, phone GPS apps can import a GPX file to display lines ("tracks"), such as trails, and points ("waypoints"), such as camps. With such apps, you can add Big Sur Trailmap lines and points, i.e. trails, camps, and water sources, by importing a single GPX files.

The GPX files provide all trailmap lines and points, plus mileage between intersections plus river crossings if multiple crossings of a river (since GPSes can zoom in more than on-line maps).

This method's advantages are:

• can be free (depending upon app)

• versions with and without trail conditions/closures available

• includes details text info for line/icon tap display

• allows high zoom levels (to max permitted by app)

• requires minimal storage [2.8Mb]

This method's disadvantages are:

• may display trailmap line colors and points differently from on-line trailmap (so losing info on trail/icon type/condition)

• some apps mix trailmap lines and points with other lines and points in the app

• some apps cannot display/hide all trailmap lines and points with single click

• updating may require deleting existing lines and points before exporting new trailmap GPX file (depends upon whether app overwrites or re-names trails with same name)

Apps with GPX import:

• Gaia GPS (for android & iPhone - free for gpx-only usage)
Import Instructions: 'Import GPX' webpage
Note: trailmap line colors are preserved, but uses same icon for all points
(some Gaia users report that waypoint name information is not being displayed - it can be made to appear by simply "editing" the waypoint, the name then magically appearing)

• Backcountry Navigator (for android - "Pro" version = one-time $15 [Jan.2025])
Import Instructions: Section 4.e of manual
Note: uses same color for all imported lines, so much BigSurTrailmap info lost

• Guru Maps (for android & iPhone -"Pro" version for over 15 tracks/points = $22.50/year [Apr.2025])
Import Instructions: 'Import GPX' webpage
Note: uses same color/icon for all imported line/points, so much BigSurTrailmap info lost
Note: their California map includes 1.5Gb of 'Navigation Data', may need to delete to reduce storage burden

• OruxMaps (for android - free)
Import Instructions: in Tracks/Routes screen, use "Import" button - see English Manual

[If you like another app, let me know and I will add it here.]

GPX file download:
with trail conditions/closures
line color ⇒ trail/road condition/closure
(Valid until conditions/closures change)
[file updated: Apr 23]

GPX file download:
sans trail conditions/closures
line color ⇒ trail/road type
(Valid for indefinite period)
[file updated: Apr 23]

GPX file Usage Notes Click to show/hide

Notes:
• To reduce file size, "lost" trails and camps are not included. Included points are only camps, campgrounds, use camps, and water sources.
• Line color is ultimately set by the app - what you see may differ from gpx internally-specified color.
• Both gpx files updated daily to match latest on-line maps.
• File size 2.8Mb

GPX copyright notice:

The gpx file's data license restricts it to personal non-commerical use, e.g. it is not to be promulgated to a public source such as AllTrails or OpenStreetMap or non-private CalTopo

What I use on my smartphone

Tiled map screenshot

(interactive example)

Phone GPS apps, such as Google Maps, typically display maps produced by a map tile server, accessed via the internet. (Tiles are small pieces of the map, covering different areas at different zoom levels.) Normally only map tiles around the active location are kept ("cached") on the phone, which saves memory - but when internet access is not available, only currently cached tiles can be viewed. For wilderness use, the below apps circumvent this problem with an "off-line map storage" capability, allowing tiles to be downloaded and stored on the device so the map can still be displayed when internet access is lost.

The tiles provide all trailmap lines and points, plus mileage between intersections plus river crossings if multiple crossings of a river (since GPSes can zoom in more than on-line maps).

(In addition to the below apps, these tiles can also be used as a background map in GIS programs such as ArcGIS and QGIS, imported as "XYZ Tiles" - see "Technical details".)

This method's advantages are:

• trailmap displayed exactly (lines,icons,background ala the on-line trailmap - displayed image varies with zoom level)

• trailmap can be easily enabled/disabled, with single click

This method's disadvantages are:

• free only for OruxMaps

• image only - tapping on trail/icon will not display text info

• zoom limited by tile maximum (level 16 = 2.0 meters/pixel)

• must ensure needed tiles downloaded before using off-line

• no trail condition/closure info

• requires much storage [440Mb]

[An alternative for these apps is in section Trailmap GPX File in GPS App]

Apps with "off-line map storage" feature:

• Gaia GPS (for android & iPhone - Premium version for off-line storage = $60/year [Jan.2025] - note that downloaded maps require renewal for access)

• BackCountry Navigator (for android - "Pro" version for off-line storage = one-time $12, "XE" version = $15/year [Jan.2025])

• Guru Maps (for android & iPhone - "Pro" version for "online maps" = $22.50/year [Apr.2025])
Note: their California map includes 1.5Gb of 'Navigation Data', may need to delete to reduce storage burden

• OruxMaps (for android - free)

[If you know of another GPS app which can use tiled maps, let me know and I will add that info here.]

General app info:

• The below instructions only add Big Sur Trailmap to the list of available map backgrounds - to use it as the actual displayed background layer requires additional steps to make it the active background, steps which of course depend on the app

• Big Sur Trailmap tiles only cover the Big Sur region (the area outside will be blank) and only zoom levels 6-16 will be displayed.

• The trailmap tiles do not include trail condition/closure information.

Specific app info:

BackCountry Navigator Click to show/hide

BackCountry Navigator has a "custom map" feature for displaying a user-specified tile map. To add the Big Sur Trailmap, under the "Map Layers" icon, select "More Map Sources" and tap its 3-vertical-dot top-right menu to select "Custom Map Source". Then tap "New Custom Map Source" and enter the following fields (tap and use keyboard): Name: "Big Sur Trailmap" MinZoom: "6" MaxZoom: "16" TileType: "PNG" TileUpdate: "None" Url: "https://bigsurtrailmap.net/TRAILMAP/TILES/{$z}/{$x}/{$y}.png" - then tap "Save". This will return to the "Custom Map Source" screen - tapping the newly added "Big Sur Trailmap" line and then "Use" will display the Big Sur Trailmap (note: the alternative choice "Edit/View" allows you to check for typing errors, should there be a problem). Note that tapping on the "Map Layers" icon will indicate that the "Online & Cached Tiles" selection is now "Big Sur Trailmap". Also note that after switching to a different map, "Big Sur Trailmap" and other previously used maps are quickly available by tapping on the current map source on the "Map Layers" screen. To display when out of internet/phone service, you must download the tiles to your phone (345Mb storage for all tiles) - see the BCN's map download help page. (Summary: with Big Sur Trailmap displayed as "Online & Cached Tiles", zoom out to show entire map area, tap "Layers" icon, tap "Select Areas for Download", drag to create selection rectangle(s) covering map area, tap "Folder" icon, set "Max Zoom" 16, tap "Save to new Named Map Folder", input "Big Sur Trailmap", tap "Create", tap "Begin Download", wait for download to be completed - note final 1% processing may take ~10 mins, do not cancel prematurely). Remember that the displayed on-line map will always be up-to-date whereas the downloaded map will require updating to be current.

Gaia GPS Click to show/hide

Gaia GPS users can add the Big Sur Trailmap to your "Layers" by downloading then importing a TileJSON tile information file". Be sure to note the folder on the mobile phone where it's being downloaded to! [The file name is "BigSurTrailmap.json"] Then in Gaia go to the map page and click the "+" icon and then "Import" - navigate to the folder where the JSON file is, then click on the file to import. Alternatively, you may be able to import the file by using your devices "Files" app - clicking on the filename may bring up a list of apps which can import the file. (Ignore any references to trails/POIs, which can also be loaded in this fashion.) You should now see "BigSurTrailmap" in your "Layers" screen - touch to make it the displayed map. (You can delete the downloaded file.) To display when out of internet/phone service, you must download the tiles to your phone (330Mb storage for all tiles) - see Gaia's iOS map download help page or Android map download help page. Note: when choosing to display a "Saved" map, after pressing "Show on Map" a considerable delay can occur (~6min) before the map is displayed. Remember that the displayed on-line map will always be up-to-date whereas the downloaded map will require updating to be current.

Guru Maps Click to show/hide

Guru Maps GPS users can add the Big Sur Trailmap by downloading my "MS tile information file". [The file name is "BigSurTrailmap.ms"] After downloading, use your device's "Files" app to import the file into Guru Maps - in that app, clicking on the filename should bring up a list of apps which can import the file. After importing, you should see "BigSurTrailmap Tiles" in Guru Maps' "Settings" > "Map Source" screen under "Online Maps" - touch to make it the displayed map, a "check" icon will appear. (You can delete the downloaded file.) To display when out of internet/phone service, you must follow Guru Map's "Caching online maps" instructions. For a tile to be displayed off-line, it must have been previously used/displayed when on-line (which saves it) - since tiles cover different areas at different zoom levels, can be tricky to ensure this is done for all tiles wanted off-line. (Is more straight-forward in other apps.) For more control over tile downloading, see the Guru Map's "Online Maps Settings".

OruxMaps Click to show/hide

OruxMaps can display maps from a tile server, including off-line by pre-loading onto the mobile phone. To add Big Sur Trailmap tiles, after installation find directory oruxmaps/mapfiles on the memory card - after making a backup copy of its onlinemapsources.xml file, use a text editor to insert (be careful!) this text into file onlinemapsources.xml, just after the "<onlinemapsources>" tag and just before the following "<onlinemapsource uid=..." tag. Big Sur Trailmap will then appear as a selection under "ONLINE" "LAYERS" "US". Alternative to avoid editing: copy this 2018 version of onlinemapsources.xml with Big Sur Trailmap added to that directory and re-name it as onlinemapsources.xml. [Tested: Aug2018] To display when out of internet/phone service, you must download the tiles to your phone. For more information, see the English manual. Remember that the displayed on-line map will always be up-to-date whereas the downloaded map will require updating to be current.

Example Tile:

Below is the highest zoom (level 16) tile covering the Big Sur Station and Pine Ridge Trail trailhead. The map has trail/usetrail/road line colors and camp/water/summit icons all ala the printable Big Sur Trailmap, which adds distance between blue dots (when over 0.2 mile) to the on-line Trailmap. This illustrate the high-resolution capability of these tiles.

Interactive Tiles Sampler:

This link provides an interactive viewer to let you see how the tiled map will appear in your mobile phone app (except the app will have its own tools, etc.) - you can zoom/move the map as an app would:

Full-screen tiles viewer

Stream Crossing Icons:

Some trails cross the same stream multiple times, sometimes in quick secession - for example, the Carmel River Trail crosses the Carmel River 27 times! Since knowing whether the next crossing is near or far can be useful, for such trails I've added crossing icons

. But the icon must be small since if larger would show only a single icon at crossings which are very close together, negating their usefulness. So if hiking such trails, you must display the tiles at their highest zoom level to effectively view the stream crossing points.

Technical details:

• Tiles are accessed at subdirectories of https://bigsurtrailmap.net/TRAILMAP/TILES/, providing 256x256 pixel PNG tiles with directory ordering "ZXY", Y increasing southward (i.e. GoogleMaps/OSM/XYZ format). An example of the tile info needed for a app is: https://bigsurtrailmap.net/TRAILMAP/TILES/{$z}/{$x}/{$y}.png. (Addendum: have now added links such that "Y increasing northward", ala the OSGeo TMS format, also works).

• Zoom levels are 6 through 16 (zoom6-13=100Kmap,zoom14-16=24Kmap).

• Bounds are 35.758° to 36.415° latitude and -121.874° to -121.162° longitude.

• The top-most tile is https://bigsurtrailmap.net/TRAILMAP/TILES/6/10/25.png

• PNG image sizes have been reduced using optimization algorithms.

• Downloading complete tile set requires 440Mb of storage.

• Some apps can use a

• TileJSON tile information file for setup:
[click to download "BigSurTrailmap.json"]

• MS tile information file for setup:
[click to download "BigSurTrailmap.ms"]

• Tiles are updated weekly using latest information.

Background map FYI

The PDF background map used at higher resolutions is the modern USGS "shaded terrain" National Map, which is the default for my on-line interactive maps, rather than the venerable USGS quadrangle map. The modern USGS map has a cleaner and more attractive look, but fewer labels than the venerable quadrangle maps. While it often shows incorrect "official" trail lines, those should be ignorable compared to the thicker, more obvious "trailmap' lines.