HI All,
I have been running a laptop based navigation system in my Jeep Wrangler since 2001. It has undergone changes over the years to accommodate changes with my Jeep. One thing has remained constant. My navigation software has been Terrain Navigator (TN). Several years ago I upgraded from the standard version to the Pro version. I have also tried other popular map packages. None come close to TN. I have not tried NG Topo.
After several failed computers due to vibration, I have settled in with a Panasonic Toughbook. My GPS is a Garmin GPS III PLus, an oldie but goodie. To save wear and tear on the disc drive, I have the topo maps stored on a 64 gB thumb drive interfaced to the computer via a USB port.
TN is primarily a topo package. Other programs will do better for towns. TN uses high resolution USGS topo maps at several different scales. Maps must be purchased on a state by state basis. I have the following state sets: 1. New Mexico (my home state), 2. Colorado, 3. Utah, 4. Texas, 5. Arizona, 6. Nevada, 7. California, 8. Idaho, 9.Wyoming, 10. Montana. The state sets include every USGS 7 1/2 minute (scale 1:2400) map for the state. That is a bunch of maps. It also includes topo maps at other scales such as 1:100,000 and 1:250,000 if they are are available from the USGS. They usually are. BTW, the map displays are all raster scans at very high resolution.
The terrain shown on the map can be displayed in 2D or 3D. 3D is useful to get a realistic view of the actual topography with features elevation shown graphically. Very nice which also works well for trip planning. Usually, when moving on the trail, I use 2D.
The map sets cost real money; $299 for each state. I have been lucky to buy my sets at sale prices: $99 each. Still, that's a lot of money. One must be very happy with the TN package to make the investment. I am very happy. They are the best.
Of course, the GPS provides real time vehicle tracking which works very well. With the maps installed on disk or thumb drives, moving from one map to the next when vehicle tracking is totally seamless. In this mode, I have the GPS set to display the trip computer and the computer to display the appropriate topo map at which ever scale that best shows the route. In the back country, I always use the 1:2400 scale. On the highway it varies but usually 1:250,000 scale with vehicle tracking always displayed. The larger scale is useful due to vehicle speed as we move across the map.
TN also interfaces to Google Earth which allows a synchronized, split screen display of the topo map and the corresponding Earth graphics to be displayed. This split mode has its uses but on the trail I just display the topo map.
The package includes many useful trip planning tools including path calculations and excellent elevation features.
From reading this thread I get the impression that folks are trying to save money by buying inferior mapping packages. I think that is showing questionable judgment. The most important tool you can have in the back country is a great mapping package. Terrain Navigator is that, for sure. It is a professional tool.
Sparky