[berta]

da un altro forum:

"I was told by a Garmin tech that the SiRF chip is better at holding a signal lock, but worse at acquiring a signal lock while moving. This is in response to the known problem of reestablishing a lock after signal loss (i.e. coming out of a tunnel). He said that if you set a 60x and a 60c on a car's dashboard and start driving without a lock, the 60c would acquire faster than the 60x. Interesting, if true."