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Archive for the 'GPS' Category

Curing Garmin Blue Flag Waypoint Disease

I’ve been asked this question twice already, which is good enough for me to write a post about it. If you use any of the color Garmin eTrex or GPSMap series, you’ll quickly discover that the default waypoint symbol, a blue flag, is pretty useless. It takes up a huge amount of screen space, and if you have multiple waypoints spaced closely together, it can become impossible to differentiate them. This is especially when the display is zoomed out to a lower scale:

blueflagdisease

There are a number of ways to deal with this problem.

1. Set the waypoints zoom level so that they don’t appear until you’ve zoom in.

The default setting for waypoints to display is Auto, which usually means that they’ll show up at virtually every zoom level. But you can set a specific zoom level so that waypoints don’t appear until you reach that zoom. From Setup Map – Points:

autowaypoints

Change the User Waypoints setting to the desired zoom level at which waypoints will first appear. E.g., the 800-ft. zoom:

800ftzoom

Since you’re zoomed in closer to the waypoints when they show up, they’ll be spaced more widely. But if you actually want them visible when zoomed out to a lower scale, you’ll need to do something else.

2. Change the default waypoint symbol on the Garmin unit to something smaller.

When you create a new waypoint on your Garmin, the waypoint icon used is the same as the last one used. If you’ve never changed the waypoint icon, that will be a blue flag. You can change the waypoint icon in the waypoint creation screen by moving the yellow highlight box using the arrow keys:

waypointhighlight

Then press Enter, and choose a smaller icon:

smallicon

I like the small green dot because it takes up far less display space than just about any other symbol. But you can choose any icon you want; or see my series on creating custom Garmin waypoint symbols if you want to design your own. Once you’ve selected a new waypoint symbol, it will be used for all subsequent waypoints you create on your Garmin.

3. Use MapSource to modify the waypoint icons.

Unfortunately, there’s no way on your Garmin GPS unit to bulk convert waypoint icon symbols created on your Garmin; you have to edit them on the unit one at a time. But if Garmin’s MapSource program (aka Trip and Waypoint Manager) came with your GPS or with a mapset you’ve purchased, you can easily do a symbol conversion, either one at a time or in bulk.

a. Use MapSource to download the waypoints from your GPS.

b. Click on the Waypoints tab to bring up a list of waypoints

Waypoint list

c. To change the icon for a single waypoint, right-click on the waypoint in the list and choose Waypoint properties; or, from the map, right-click on a waypoint and choose Waypoint Properties. This brings up a dialog box with a icon symbol selection drop-down:

waypointproperties

d. To change the symbol for multiple waypoints, Ctrl-click on them in the Waypoint list; to select all the waypoints, click in the Waypoint list and then press Ctrl-A. Then right-click on any selected waypoint, and choose a symbol; your choice will be applied to all the waypoints. You can then save these waypoints in a file, or export them directly back to your GPS. For the latter, you might want first to delete the old waypoints with the undesired symbol; Garmin unit give you the option in the Waypoints listing screen to delete all waypoints that share the same symbol.

Having done this with the waypoints in the first image, converting them to green dots:

greendots

You can now differentiate different waypoints, where before they were a mass of indistinguishable blue flags.

This is also a useful technique to use when creating waypoints in a program that doesn’t support Garmin waypoint icons directly, like USAPhotoMaps; loading waypoints directly from a program like this into a Garmin GPS may result in Blue Flag Disease. Create the waypoints in this program, then save them as a GPX file and load them into MapSource. You can then use the above process to select your desired waypoint icons, and load them into the GPS.

4. Use GPS TrackMaker to modity the waypoint icons

If you don’t own MapSource, you can use the free program GPS Trackmaker to import waypoints from a Garmin, or from a GPX file, and then modify they waypoint icons. One at a time is easy – with the cursor in “Select data” mode (white arrow), move the cursor to near the waypoint until a black circle appears. Right-click on that black circle to bring up the Edit Waypoint window:

gpstm edit

Click on the Garmin tab to see only Garmin-compatible symbols, then choose a new symbol from the icons visible in the window. You can then upload the icons directly to your Garmin from the GPS menu, or save them as a GPX file.

Bulk conversion is also pretty easy. Use the Select data cursor to select all of the waypoints you want to change (click-and-drag to select a rectangular box). From the menu at top, select Tools => Waypoints =>  Change Selected Wpts … . A window similar to the one above will come up:

gpstm bulk

As before, choose the Garmin tab, then select the icon you want to use. Save it as a GPX file, or upload directly to your Garmin.




Automating Your Garmin Oregon Photo Geotagging Flow Using GeoHarvest

There are a number of stand-alone Windows apps and web apps that led you geotag photos by matching the time they were taken with points on a GPS track (see the geotagging category of this blog for examples). But all of them require you to start up the program, load in the photos, load in the GPS track, and then start up the geotagging process. Flip Fahrenfort geotags a lot of his photos, and got tired of the multiple steps involved. So he wrote GeoHarvest, a program that automates the process to a large degree for owners of Oregon Garmin GPS units. When a memory card or camera is attached to your computer, it can automatically download a copy of digital photos from a memory card/camera to a folder of your choice, and keeps track of the photo filenames. When you connect a GPS, it will download track data and save it in GPX format. It then matches up the track times with the times the photos were taken, and geotags the photos with the appropriate coordinates.

The program can run continuously on your system, monitoring for all inserted memory cards or attached cameras with images to download, or GPS units with tracks to download as well. But if you want it to run this way, you’ll have to copy a shortcut to the program to your Startup folder manually, since the program doesn’t come with an install program that does that. It also can run in single-transfer mode, so that you can connect the data sources, have the photos geotagged automatically, then have the program terminate.

Unfortunately, since I don’t own a Garmin Oregon unit, I was unable to figure out how well it works with that unit. And while the program option suggest that you should be able to get the program to work with other GPS models with some manual work, I was repeatedly unsuccessful at this – GeoHarvest refused to accept GPX files generated by multiple programs. There are online help pages on program configuration and usage; if you can get it to work with your non-Oregon GPS, please leave a comment below.




LandSerf – Google Earth And GPS Functions

In previous posts, I reviewed LandSerf’s raster terrain analysis functions and vector functions. Today I’ll wrap up with a short review of LandSerf’s Google Earth and GPS functions.

Google Earth: The most notable Google Earth functionality is the ability to export vector data, either imported or generated by the program, into KML vector files. So I can open a DEM, like the sample one of Mt. Rainier included with the program:

lsdem

Generate a set of flow vectors for the DEM:

flowvectors

And then export the vector data as a KML file:

rainier

You could do something similar with a shapefile opened in LandSerf, but just be sure the shapefile is in NAD83 or WGS84. As I mention in the post on LandSerf vector functions, LandSerf has problems re-projecting from one datum to a significantly different second datum, and Google Earth data needs to be in WGS84 (NAD83 is almost the same). A search for “KML shapefile” on this blog will bring up a number of other programs that do a better job of converting shapefiles to KML, including preserving attribute data, which LandSerf doesn’t. But all of those are Windows-based; LandSerf runs on Macintosh and Linux, so it might be a useful option for those OSes.

Note: You should save vector data as a KML file; the KMZ file format is supposedly reserved for saving raster data as Google Earth image overlays, but I’ve been unsuccessful in getting that to work.

GPS: The list of useful GPS functions in LandSerf is a bit longer:

  • Convert loaded shapefiles or other vector data to GPX format (data must be in WGS84/NAD83 datum)
  • Load a GPX file as vector data, then save it in any of the vector formats LandSerf supports
  • Interface directly with a GPS. You’ll need to have the GPS connected to your computer and turned on before starting up LandSerf. To establish a connection to the GPS, use Configure=>GPS and scan for a connected unit. Once you do this, you can import waypoint data using the File=>Import from GPS function. While the dialog box gives you the option to import waypoints, tracks and routes:

gpsimport

I’ve had difficulty getting tracks to import successfully – the program just shuts down on me. This may just be an issue with my model GPS (Garmin 60Cx); f you have better luck, let me know. You can import the data in the default lat/long coordinate system. or re-project it on import to OSNG or UTM. Once there, you can export it in GPX, shapefile or other vector format.

  • You can also export point data (no lines or polygons) directly from LandSerf to a connected GPS as waypoints.

If you can get track data to import successfully from your GPS to LandSerf, which I couldn’t, there are several other functions that might prove useful:

  • On importing the data, you have the option of saving all the track data in spreadsheet format with position, elevation and time
  • As with other vector data, if you have a digital elevation model loaded in the program, you can get a elevation profile plot; see this previous LandSerf post for more info
  • If you have a GPS track that is broken into .segments because you lost the GPS signal, LandSerf has the ability to join all of the line segments into a single line, which you can then save as a GPX track file, using the Edit => Join vector lines function. AFAIK, it’s the only free program that can do this.

As with the Google Earth functions, there are other programs that can do most of this in Windows, but far fewer free options in Macintosh and Linux.




Online GPS Format Conversion And Track Creation With GPSies

GPSies is a site whose primary function seems to be as a social site where you can upload tracks of your travels, and have them posted on a map to keep track of them or share them with others. Tracks can be uploaded from standard formats like GPX or KML, directly from Garmin GPS using the Garmin Communicator plugin, or from the iPhone using their free app. This social aspect isn’t something I’m all that interested in doing, so those features are wasted on me. But the site has two tools that GPS users will find useful:

Continue reading ‘Online GPS Format Conversion And Track Creation With GPSies’




Garmin BaseCamp Released

If you own a Garmin mapset that includes DEM data, like their 1:24K topographic mapsets or Topo US 2008, you might want to download and take a look at Garmin’s new free 3D map viewer and GPS data editor, BaseCamp. Here’s a screenshot using Topo US 2008 data:

3-30-2009-11.10.29 PM

On the plus side:

  • 2D/3D/Overview map views
  • Elevation profiles along a track
  • Photo geotagging using a GPS track
  • Some advanced editing features, like a track split function and eraser

On the down side:

  • Program is slooooow, even on my fairly recent quad-core system
  • Default 3D view is too subtle, even with decent topography; go to the options section and change the elevation exaggeration to something more useable, like 200%.

It’s probably worth downloading if you have a compatible mapset, but I don’t find the new features compelling enough to make me switch over from Garmin’s older Mapsource program to BaseCamp, especially given how sluggish the latter is. Hopefully future versions will be snappier, and add more features.




Free Introductory Guide To GIS And GPS

MapAction is a non-profit volunteer organization that provides GIS and mapping services to disaster areas. They’ve just published a free 118-page Field Guide To Humanitarian Mapping that’s a terrific introduction to both data acquisition using a GPS, and how to use Google Earth and the free open-source Windows GIS program MapWindow for mapping. I’d even say that it’s a far better choice for beginners than the recently-published GIS For Dummies (more on that soon, when I get the review of that volume done).

Via GIS @ Vassar.




A (Reasonably) Cheap Portable Auto Mount For Handheld GPS Units

For my regular car, I use a standard Garmin adjustable bracket mount to hold my Garmin 60Cx handheld GPS receiver:

bracket

Works fine, position is adjustable – great. But I can’t really use it easily in another car, since it slides into a bracket mounted with adhesive on the dashboard, and I’d need to glue a similar bracket into the other vehicle. Sticking the GPS into a cup holder, or holding it in my hands, isn’t always an option. On a recent field survey trip, I needed to be able to read the location while driving over a very rocky surface while dodging creosote bushes. Holding the GPS in my hands while keeping control of the steering wheel was …. interesting.

So when I stumbled across the Vent Mount from TheClip.com, it looked like a possible solution: a cheap GPS mount that you stick into a car’s vent, and can be easily moved from car to car. The mount is pretty straightforward, four pieces of molded plastic that snap together; here’s a side view (picture from the website):

3-8-2009-7.48.35 PM

The two pieces at upper right slide into one of the louvers in your car’s ventilation system, with the lower brace holding the mount base in place:

3-8-2009-7.57.10 PM

The GPS is mounted on the base by sliding a round swivel tab (like those found on many cellphones that slides into a belt clip) into the notch at the top. My GPS comes with a swivel tab as standard equipment:

vent

If you have a GPS that doesn’t have a tab, they include three tabs and high-strength adhesive pads to stick them on the back of your GPS unit. You could also use the extra tabs for cellphones, PDAs, MP3 players, or any other portable electronic device you might want to have handy in your car.

Overall, the product seems to work quite well; the GPS stays in place even on rough roads, and there’s enough room between the GPS and the vent for air to flow. But a few caveats:

  • It will work on vents with horizontal or vertical louvers, and ones that swivel left and right; but not on vents that swivel downwards. Mount your GPS on a downward-swiveling vent, and it will droop into an unviewable position
  • You may have to play around a bit with the installation configuration; in my car, the vent snaps worked better when they were rotated 180 degrees from the normal position. YMMV.
  • Once you figure out the trick of installing and removing it from a car’s vent, it literally takes only a second to do. However, learning how to do that trick may take a couple of minutes, possibly interrupted by a curse or two.
  • For some units (like mine), there’s not enough clearance for the external power connector/USB connector in the back; for those, you’ll have to use it on battery power alone.
  • List price is reasonable ($8.99), but then they tack on $5 for shipping, which seems a bit steep. Still, it’s a lot cheaper than a standard Garmin auto bracket mount ($25-30), and if I had known about it, I might not have bought that Garmin mount.

Overall, I’ve found the Vent Mount useful, and would recommend it if you need to use a handheld GPS in more than one car.

Full disclosure: I paid full price for this item, and this is an unpaid and unsolicited endorsement.




Garmin’s Free ecoRoute Software Now Available For Some nuvi Automotive GPS Models

From the Garmin blog, Garmin’s new ecoRoute software is available as a free upgrade for compatible nuvi models. This software allows you select routes based not only on shortest distance, but also on fuel efficiency, factoring in road speed and acceleration data for road sections.; it also tracks fuel consumption and mileage. To install it, download and run the WebUpdater (available here), then select ecoRoute from the options list.