design and support for advances in cartography and hardware technology with its release of the eTrex 10, eTrex 20, and eTrex 30, Garmin became the first company to manufacture and distribute a worldwide consumer navigation product supporting both GPS and GLONASS satellite constellations. On May 13, 2015, Garmin released the eTrex 20x and 30x, which succeeded the eTrex 20 and 30. The main upgrade was a higher resolution screen and 4GB storage, double of the previous models. On July 2, 2015, Garmin introduced its eTrex Touch line, releasing three models (25, 35 and 35t), all featuring a 2.6" touch screen. The 35t model designation is not used in Europe, but the European market 35 is essentially the 35t, and both the European 25 and 35 include Garmin TopoActive Europe maps and 8GB of internal storage. The Geko series was a compact line of handheld GPS receivers aimed at the budget or lightweight hiking market. In 2004, Garmin introduced its 60C line of handheld GPS mapping receivers, featuring increased sensitivity and storage capacity along with a battery life of up to 30 hours in battery-save mode. This was followed by the 60Cx and 60CSx with improved color map displays. With the GTM-11, GTM 20 and GTM 25, a Garmin GPS device receives and uses traffic message channel (TMC) information. Also, some Garmin nüvi (1690, 1490T, 1450T, 1390T, 1390, 1350, 1260, 1250 and 265WT, 265T, 265W, 265, 255w and 255) comes with an integrated TMC receiver. iQue PDA receivers In 2003, Garmin launched the iQue line of integrated PDA–GPS receivers. On October 31, 2005, the iQue M4 became the first PDA that did not require a PC to preload the maps. The American version came with built-in maps of North America, while the UK version was supplied pre-loaded with maps of Western Europe. Dog tracking and training On June 2, 2011, Garmin introduced Astro 320. On June 12, 2014, Garmin introduced T5 and TT15 Collars for Astro and Alpha. On July 31, 2015, T5 mini and T15 mini collars were added. On June 16, 2016, Garmin introduced the Astro 430. On October 10, 2016, Garmin added pairing of the Astro 430 and Alpha 100 to Garmin Smart Watches. Fishfinders Garmin also manufactures a line of sonar fishfinders, including some units that also have GPS capability, and some that use spread spectrum technology. Laptop GPS and mobile apps In April 2008, Garmin launched