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If you only view them as assistants that might make a mistake occasionally, then they might be helpful.
At least if it gets you into the same situation again, you can direct your anger to it. Misplaced though it is. <<grin>>
Here is a link to Garmin's comparison of the two.....
I don't use these types of gps's. So I can't really tell you much from experience. However I've seen posts here and elsewhere. I think the praise outweighs the cursing. But realize that map data which this device depends on may be inaccurate in some areas.
I'd imagine garmin winds up purchasing an "off the shelf" barometric sensor package for each of it's devices. And in quantities equal to the planned manufacture life of the unit. But as each device has a different design/manufacture time frame for both Garmin and the sensor manufacturer, that many Garmin device are getting barometric sensors that may or may not be as good as another. Or require different massaging of their data because of the accuracy and resolution of their data.
I know that my edge500 was touted as being accurate to 50 feet, but the later edge510 and 800's are accurate to 10 feet. Yet both will show at least two feet of change as you move about.
Again, at least to me, it's comparing apples and oranges.
Comparing data for gps tracks from different times of the year can be apples and oranges too as the satellites are not geosynchronous and some times are in a position for a good fix and other times not.
I finally took the time to look up the Dakota 20. It's not as old as I was thinking so it has a better chance being fully compatible with Garmin Express (GE) and Garmin Connect (GC).
In the overview it does mention that you can upload activities to GC. But in the optional accessories it only list a temperature sensor, the Garmin Tempe as the only available fitness sensor you can connect it to.
The manual states that it can pair with a Garmin heart rate monitor and a Garmin cadence sensor but does not mention anything about the Garmin Tempe..... but that's an occasional or maybe not so occasional point of confusion Garmin creates at times.
Nor does the manual mention anything about GC. As well it doesn't state what file formats it accepts.
At the Garmin Forums in the Garmin Express section, a search on "Dakota 20" pulls up several old posts that might be useful/interesting to the OP.
So it still looks like nothings for certain between GC and the Dakota 20. And experiences may vary between different users.
The frustrations of trying to get the Dakota to work with GC may not outweigh the frustrations the OP has with Basecamp. Basecamp does get easier the more you use it.
What coordinate format do you have your nuvi set to use? Garmin devices I'm familiar with are very particular about the format you enter your coordinates. I don't recognize the format your's are in as you have two decimals in each coordinate.Thought it might be useful to give a coord that I can't enter. Interestingly, I've just tried this one and I can't enter above 5 for the Long either!
Can anybody else enter that on a Nuvi 2595?
I suspect what you need to do is substitute a space for the first decimal in each coordinate if that is in fact how you are entering them in your nuvi.
You have to make or get the maps from somewhere if you want the GPS positions associated to a position on a map. I don't do any of this stuff myself, but I have played with software that will let you take most any image you want and scale it and calibrate it to match actual lat/long coordinates. Then the result could be used with GPS data to show a position or track using that image. The image could be a raster chart, an aerial/satellite image, or even a drawing that you scanned as saved as an image. The only key thing is you needed to be able to identify coordinates on several points of that image so the software could associate it with the lat/long datum you choose to use.
Most recreational GPS's come with a map, but I'd think their accuacy not suitable for what it sounds like you want. Especially in buildings or under roofs.
You might google "spot gps" and look at what they do with consumer grade trackers and get some ideas.