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De https://web.archive.org/web/20161116...gps/gps38.html :

The End-Of-Week-Rollover problem

After 22nd August 1999 the internal week counter in some Garmin GPS receivers (including the GPS38) rolls back to zero because it has insufficient precision to count beyond a certain value. If the GPS receiver firmware is not updated to a new version the unit will experience slow acquisition of satellites and take a long time to get a fix on its position. This is because the GPS receiver thinks it is in a different week to the real week and it will attempt to use the wrong ephemeris data to locate satellites.

Ver tambien: http://gpsinformation.net/main/eowgarmin.htm

Si no localizais el parche, contactar con garmin: https://support.garmin.com/es-ES/

edito: el apaño de Garmin rescatado de archive.org
http://web.archive.org/web/200910262...C_Software.zip
http://web.archive.org/web/200910262...sEOWreadme.txt
https://web.archive.org/web/20000301...om/faqs/1.html