A curious thing happens with the GTM 26 and 36: they do not work with Jetmouse signature on gps Garmin with firmware 2012 (34/35xx, 2xx5), but works with previous (1xxx, 37xx) and now, according to reports of Tadferreira, with 2013 (3597 ..), that is good news. Interestingly is that the GTM 60 works with gps 2013 but it, in the latest firmware version, does not work at all with the GPS 2012. After some work, I did a change in the firwmare of GTM60 to enable traffic with Jetmouse signatures with gps of 2012 (34xx, 3590..). So that appears someone that need, I will publish this firmware.