Over the last few weeks, I’ve found myself making quite a few conversions of maps between different formats, for different uses (mostly cycling-related). The things I’ve found might, or might not, be useful to others… so I’m writing them down anyway!
Firstly, I wanted to see what the profile of a route was like. I had a GPX file for the route and used the excellent GPS Visualizer site to create an elevation profile. And then quickly decided it had far too many bumps!
Next up, one of my fellow riders wanted to be able to view the route in Google Maps (not Google Earth). This wasn’t quite as straightforward but, again GPS Visualizer comes to the rescue. Using that site, it’s possible to convert to a KML file that Google Maps can work with. Unfortunately, the “new” Google Maps doesn’t have an import option so you need to switch back to the “classic” Google Maps (it might be enough to use this version of the URI: https://www.google.com/maps?output=classic), after which you can use the Google Maps Engine to create a map (like this one, which was stage 1 of my recent London to Paris ride):
Finally, I bought a Garmin Edge 810 (cycle computer). After months of saying “I don’t need a Garmin, I have Strava on my iPhone”), I gave in. And I’ve been pretty glad of it too – already it’s been great to monitor my stats as I climbed Holme Moss last week (does 98% maximum heart rate mean I’m 2% off a heart attack? </joke>) and last weekend I decided I was 20-odd miles from home and bored of my ride, so the sat-nav could show me the best way back to my starting point (even if it did mean cycling along some trunk routes…). Added to that, Mrs W has been glad to track my rides using the Garmin 810′s Live Tracking (although it didn’t work last time I was out…).
The Garmin comes with “base maps” but these are really just the main roads. As they’re probably not the ones you want to use for cycling, it’s handy to load on some more detail. Ordnance Survey 1:50K maps (GB Discoverer) may be great (the 3D view in particular) but at a penny shy of £200 I wasn’t prepared to pay that much, with Open Street Maps available for free. ScarletFire Cycling has made a video with an interesting comparison of the OSM and OS map options:
Downloading the Open Street Maps to a Garmin Edge 705/800/810 is brilliantly described by DC Rainmaker and Forgot has a write-up for getting turn-by-turn navigation working on the Edge 800, as does ScarletFire. It can take a couple of days for the maps to be generated though and I did find a direct download link with maps that had been generated fairly recently (July 2013), so I used that.