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(More customer reviews)I must say that I find it interesting that there are so many glowing reviews about this flawless GPS. I am always skeptical of anything that sounds too good! I read many of the reviews online, and after evaluating the specifications and features, opted to buy the Delorme PN-40. Prior to this purchase, I owned a Garmin 60CSX GPS. I believed that the Delorme was poised to be a significant improvement in both the tracking ability and the display of aerial overlays.
Let me begin by stating that I don't believe there is a perfect GPS except from the perception of the user and their application. If it meets your criteria, then it serves the intended purpose! That being said, let me try to summarize my personal observations from my point of view.
After purchasing the Delorme PN-40, I quickly signed up for the $29.99 annual download service to take advantage of this impressive feature. I have downloaded about a dozen maps at this posting and must say that Delorme has been very effective in minimizing the number of maps that can be downloaded. First, the size of the maps you can download for each map type (color aerial, USGS, etc..) is restricted to some size in sq Km. This isn't too much of an issue as they are large enough for my typical hike. Second, I have found that the download speed is being limited to speeds on the order of 15-20Kb/s. This is incredibly slow considering the capability of cable is in excess of 700Kb/s. A typical download time for the maximum 250sq/km file is over 1.5hrs. In addition, many of the downloads stop prematurely, and this requires you to download the entire file again (a download manager isn't able to resume the download after termination). I have spent days trying to download a single file due to premature downloads (and no, my modem and router aren't the cause!)
The learning curve for uploading the map files to the PN-40 is tricky and not documented very well. It took me (I'm an electrical engineer) about 4 hours to sift through the documentation along with some trial and error. Once downloading was accomplished, I found that the display of the maps was pleasing, but lacked detail.
I then took the Delorme PN-40 and Garmin 60CSX (Sirf Star III chipset) on a 9 mile hike in Forest Park located in Portland Oregon. I used fresh Powerex Medion batteries in both GPS's. The temperature outside was about 35degF and the hike took approx 5 hours. My findings are as follows:
The Delorme PN-40 took several minutes longer than the Garmin 60CSx to lock onto the satellites before a 3D view was possible. The Delorme circle of uncertainty, accuracy of the location, varied significantly while standing in the same spot on open terrain with no obstructed view of the sky. The variation would be on the order of +- 15ft to +-40ft. The Garmin locked onto the signal vary consistently for this same location with variations of only +-2ft. I found the aerial display on the Delorme to be difficult to see without the backlight. Note that the isobar lines aren't easily seperated from the aerial background. It may just be me, but I'm not color blind and have good vision. The Garmin display is easier to see, I think, because there isn't much clutter on the display (the backlight helps very much in low light also). The Delorme tracking lines are superb! It is easy to see where you have gone and is nicely color contrasted to the background map. The Garmin tracking points are almost impossible to see (until downloaded to your PC) as they blend into the topo map! The last point I want to make concerns the battery life, and this was the biggest issue for my personal use. The Delorme battery life was barely acceptable (for my purposes) under the conditions of this hike (cold and wet for 5 hours). The battery indicator on the Delorme started dropping after about 2.5 hours and declined steadily for the remainder of the hike. The last hour of the hike I expected the Delorme to shut off, but the batteries did hold out for the full hike. The Garmin battery life remained at full for the entire hike. You can argue that my test wasn't exactly fair since the batteries weren't brand new and don't know how often I used the backlight, but I didn't expect the Delorme to start indicating reduced battery power so soon. A sample size of one unit is not exactly a great indicator of all the units sold, but then I'm not being hired by anyone or trying to take sides! Obviously, you must be the decision maker for your application.
I will say that both products performed well enough for this one hike. I prefer the Garmin for satellite reception, consistent locking, battery life and ease of software use. However I do like the display capabilities of the Delorme. Also, the Delorme mapping is far superior to Garmin, but at the expense of a steep learning curve. I also want to mention that Delorme did a great job for allowing use of every battery type you might want to use; from lithium ion to alkaline. Also, I really appreciate Delorme giving easy access to the full capacity of a 32Gb SDHC card (which I verified worked well), but you do need plenty of storage for the hybrid aerial maps.
In summary, let me say that in my opinion I feel that Garmin has the lead on GPS hardware and that Delorme has the lead on Mapping software. I would love to see a product created by the merger of these two companies to take advantage of both of their strengths. Good luck on your purchase decision.
Note that I am not an employee of either company, and have no personal bias towards them. I also own products from both companies!
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