audible speed alert

You really can't. The best solution is to just pay attention. In addition, the speed limits on the maps aren't always accurate.

The speed limit icon for your model will change colors when you exceed the speed limit . It does appear if you change countries in the settings you can get a alert. See http://support.garmin.com/support/searchSupport/case.faces?c... for more info.

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You CAN'T set speed limits but you can correct inaccurate speed limits on the 2xxx series, you're capable of doing so on your 2597.
Give this site a look:
http://gpstracklog.com/2011/01/nu-feature-speed-limit-adjust...

That being said, I believe when you do a map update the inaccurate limits will return but I'm not positive since I don't bother making the changes on my 2460.

There were many locations while traveling that the map speed on the Nuvi was wrong. but I agree with member fossy, it's wisest to follow posted signs to be safe.

On a side note, I know the HERE Android app does provide an alert if you go a specified amount over the speed limit.

What you can create is a file that "pretends" there is a speed camera file along the road. In this instance, it sounds like you would want to have an entry that would alert when you were going "over" the speed limit plus 10. So, your entry would be (in .csv format)
lon, lat, "Speed 50 - frontage road near me @50","my town, Nov25 15"
where you will find and enter the lon and lat for perhaps several points along the road so that you would be reminded. The lon and lat can just be in the center of the roadway.

Note that Speed in a file name is a word that indicates to POI Loader to assume it is a camera file.

That article needs correcting. In fact, you cannot adjust the speed limits on the 2597.

This is a common problem when, for example, an older message refers to a 2xxx feature when it should really be 2xx0 since it may not be a feature on the 2xx5, 2xx6, etc. series models.

Here's Garmin's most recent faq on which series offer speed limit adjustments:

https://support.garmin.com/support/searchSupport/case.faces?...

Note that all nuvi models offering speed limit adjustments have a final digit of zero.

Sorry for the misinformation, I should have checked the date of the article which was January 2011, the 2597 was released in March of 2013. CraigW's link gives updated information and does show the 2597 as NOT having speed limit adjustments.

This links breaks it down both ways. Ones that show the speed limit indicator and ones you can manually adjust. http://goo.gl/bFCZmH

Yes indeed, the use of things like 24xx are especially problematic when the post is old and prior to the introduction of 24x5 models. Quite often, a posted 24xx for example, really should be written as 24x0.

It's probably not 'live' yet but this does warrant a faq and I've just submitted one:

http://www.poi-factory.com/node/45414

The editable speed limit is another one of those weird cases where Garmin introduces a nice feature on a new model, then promptly abandons it on the next model. They did the same thing with customizable dashboards on the 34x0/35x0. I think the problem is that there is a shrinking pool of customers who want advanced features on a GPS (like some of us here on POI Factory). So it just isn't worth the development/support costs to offer advanced features ... just another consequence of the smart phone revolution.

They just keep dumbing them down.

Partly correct..

It costs $$$ to create these programatic functions and frequently more $$$$ to retrofit these functions into new later releases.

When one considers the very real likelihood single function GPS's Will soon be swallowed mostly by Cell phone AP's anyone owning a company that creates GPS's would need to carefully examine the profit margin especially when considering retrofiting software from product version to product version. Its not that carrying forward functionality is hard, it's how she various releases are designed. Meaning, these kinds of design points need to be baked into the product from the beginning.