accuracy of maps

[Jeep or Tacoma]

seems like a lot of you are using different maps applications on your tablets. What if any issues have you come across as far as too accuracy? dirt road accuracy? etc.
and where do all the top base maps come from ? is it a singular source? like usgs? or cgs? how are the top maps field verified?

Most top map are flown by the gov and spot checked you've see the big x on the ground a surveyor will actually local one and get the 3 coordinates now with a gps but it used to be via survey equip.

so does garmin delorme motion gaia etc all gather base maps form the same place or are there different sources? How often are they updated ? or verified?

It would be cool to get some old maps and look for lost mines and treasure too.

 

[doug720]

Old maps are the outstanding sources of information, and I keep all my old maps and look for more...

The new Government maps (most maps are based on Government maps) have omitted many types of information from their data base. Things like historic areas, ruins, mines, cabins, roads and trails. The reason for this are many; theft, destruction and the threat of a law suit of someone gets hurt at an area deemed an "Attractive Nuisance" by some lawyer.

When I plan a ride or want to explore an area, I look at at as many available maps as possible. Compare one to another, and the maps to satellite images to see any differences.

Maps are a fun and interesting tool, especially old and specialized ones.

 

[Desert Dan]

Save your old road maps and topos since some things get omitted from newer publications.

The Auto Club of Southern CA's countyand special interest maps (Death Valley, Baja Indian Country etc.) are driven periodically to update road conditions, mileages, new roads and closures.


I think the USGS still has mapping crews out in the field updating topos.