Related

Route 'smoothing' and back country navigation; loss of route detail on imported GPX's?

5199169
over 1 year ago

Hi all. I've just replaced an eTrex 32x with a GPSmap 67i, and have questions regarding route detail in the 67i compared to the eTrex

Specifically, I'm unclear about how to get accurate route detail on the 67i, as running an existing GPX through Explore and syncing to the GPS as a route seems to cut out so many points and straightens pathing, in a way the eTrex doesn't.  

I'd like to use the 67i for an upcoming back country trip that mostly follows footpads, in significant fire regrowth. I am concerned that the 67i simply won't provide the routing fidelity to keep me on track, and get me back onto it when I, inevitably, wander off it. 

I hope this is just me being a noob to the new GPS?

Many thanks for your advice

  • 0 over 1 year ago

    What kind of GPX file is it, track or route? If it's a Track, just import it as a Track in Explore. After syncing you can find it under Saved Tracks on the GPSMAP and follow it like a breadcrumb trail. The GPSMAP will not re-calculate when you go off course but can warn you if you do.

    If you import it as Route and the original GPX has a lot of data points, the unit will reduce the number route points which may lead to truncated routes. On the GPSMAP Routes tend to work best if you just have a few location and want the device to calculate a path for you based on the active map.

    Alternatively you can convert a Route or a Track to a Course in the Explore app (Copy as Course menu option). On the GPSMAP you can use Courses either as a breadcrumb (when Setup > Routing > Course Navigation is set to Direct) or as a route with turn by turn instructions (when Setup > Routing > Course Navigation is set to Roads & Trails). But be aware that depending on the Course and the map in use, route calculation may be quite slow.

  • 0 over 1 year ago in reply to JungleJim

    This is accurate. It’s actually the Explore app which “thins” the route to 200 points or less. Nobody knows why. Everybody complains. But that’s a detail. Fact is that the resulting route may well be useless - exactly as described.

  • 0 over 1 year ago in reply to JungleJim

    thanks so much for the detailed reply. I had a play with things based on you advice, and think I have something close to a useful solution Slight smile