![]() ![]() If we want to get optimal performance from our 660 devices, we need to store our cartographic data (map data) within the built-in internal memory of the device, and leave the micro-SD slot empty. The 660 cannot read cartographic data off the SD card as quickly as it can read the same data from internal memory. ![]() There is, however, a significant penalty associated with storing maps on a micro-SD card. If we want to fit all the maps, we need to use a micro-SD card to expand memory capacity - in fact, the Garmin Express application prompts us to use a micro-SD card if we want to download all the available map regions. So, I did a wee bit of investigation, and found a way to optimize performance of my 8 year old device.Īs those of us who own 660s know already, it is no longer possible to fit all of the maps for one continent (Canada and USA for the "Americas" version of the 660, all of Western, Central, and Eastern Europe for the "Atlantic" version of the device) into the internal memory of the 660. Over the years, the performance of my 660 has deteriorated - it takes longer to calculate a route, and at times it has been painfully slow to figure out how to get me back onto a route when I have made a wrong turn.Īfter putting up with this slow performance for a few weeks (made worse by the fact that I was riding in the UK, on a different side of the road than I am used to), I had had enough - I wasn't prepared to fork out the big money required to buy a newer device, but I couldn't live any longer with the slow performance of my 660. It would calculate routes reasonably quickly, and more important, when I accidentally got off-route it would quickly recalculate and display directions showing me how to get back onto my route. I bought this gizmo back in 2011, and when it was new, it worked pretty well. I've just finished a month of riding around in Europe, using my Garmin Zumo 660 navigation device. ![]()
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