Rated 4 out of 5 by CRMath Best Available, But Not Perfect
The one feature that makes this product more useful than its competitors is that roads and trails are truly routable. Unlike some other products, it's possible to mix roads and trails in a single route. Other products I've tried simply don't support that capability.
That said, don't expect the level of detail that appears on USGS paper maps or 1:24,000 digital scans. I examined this product in some detail using BaseCamp (Garmin's free PC application) and found such important landmarks as power transmission lines and railroads to be missing. Surprisingly, these features are present in Garmin's old (and not routable) Topo USA database from 10 or so years ago.
I also compared trail detail against scans of USGS 1:24,000 maps. Many logging roads and foot trails that appear on the USGS maps are absent from Topo 24. I realize its impossible to produce a comprehensive, accurate database from maps that were manually produced from aerial photographs, so I didn't expect every footpath to be included. Just be aware that your favorite local trail may be missing. Also, don't be surprised if your GPS shows your actual track to be displaced from the trail; the USGS maps are only survey-accurate at control points. Everything else on the aerial images is stretched and contorted to fit. 50 years ago the process manual and none to precise.
Overall, this is the best consumer-grade product available. I hope Garmin comes up with a process to provide periodic updates.
September 20, 2013
Rated 5 out of 5 by BikerB Worth the Money
Used with a Garmin 62s. Don't get the 62st with the pre-loaded maps. You will be sorry you did. Buy the 62s with the sd chip. This will give you 24000 scale instead of 100000 scale topo.
June 29, 2011