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Yes, you will be able to do that once you install and activate the map.
Why the external/roof requirement. What about just leaving something like the GLO on the dash, inside the vehicle?
DeLorme's background is a mapping company. I live in a very remote area, and most maps are terrible. While the topo lines themselves might be fine as everyone uses similar datasets, the actual features on the topo maps (forest roads, small streams, types of vegetation, etc) are important to me. I can get the detail I need from the DeLorme maps, but really nobody else has accurate maps in my area.
For that reason, I still use my PN-60. And I also do quite a bit of my outside activity in bitterly cold weather when the last thing I want to do is to take a glove off. So the PN-60 does me well there too.
But yes, even for DeLorme's flagship model it is showing signs of age.
I'm going to disagree a little bit with what has been said. While the antennas (perhaps more accurately called receivers) inside a GPS are very sensitive, they are not very large. They don't have a very big net to capture the signals. While they might be sensitive to detecting weaker signals they don't necessary do a great job of capturing weak signals.
GPS is essentially a radio broadcast your GPS receiver listens to, very similar to FM or AM radio. FM radio operates at 88 - 108 MHz while GPS operates up near 1100 - 1600 Mhz. Recall old radios with telescoping antennas and how much of a difference extending the antenna can make.
An external antenna will help in a similar fashion. It isn't that the external antenna in a different location than the GPS (with exception for the scenario noted above where the GPS is blocked inside something like a car) but that the antenna is longer and larger and thus is able to cast a bigger net to catch more signals.
The big, blocky antennas on older GPS devices helped cast a bigger net when the receiver chip wasn't as good at picking out weaker signals. As the chips became more sensitive the bulky antennas were no longer necessary and wen't out of style. But they are still useful in casting a bigger net.
Don't get me wrong, I don't think it will make a huge difference, but an external antenna does provide more of an advantage of simply putting the receiver in a different location.
Any GPS can of course produce strange routes from time time. The two major factors are (1) the accuracy of the underlying map data and (2) the strength of the routing algorithm.
As for map accuracy, this will vary from location to location so it is difficult to say which might be better for you without people having local knowledge of both maps. (Difficult to find.)
As to routing quality beyond the extent of the underlying map data, manufacturers need to balance the expense of faster processor speeds and the patience of people waiting for the GPS to calculate a route in addition to just having route smarts. A GPS won't consider all route possibilities and the more shortcuts it looks for the longer route calculation will take... so at some point the GPS just spits out the best route it has found, which isn't always the best.
In my years of experience with multiple brands across different parts of the country I'd give a slight edge in map accuracy to the maps Garmin licenses from 'Here' while at the same time giving an edge to TomTom when it comes to smart routing algorithms.