GPS's battery draining behavior is most noticeable during the initial acquisition of the satellite's navigation message: the satellite's state, ephemeris, and almanac.

Mobile devices such as Android and the iPhone achieve their battery life largely because they can aggressively and quickly enter into and exit from sleep states. GPS prevents this.

What though the sea be calm? trust to the shore, Ships have been drown'd, where late they danc'd before.

Compounding the cost, most mapping software is processor-intense.

Garmin Mobile exposes an entirely new group of consumers to turn-by-turn satellite navigation, ... We are thrilled that Sprint Nextel, an industry leader in voice and data communications, has chosen Garmin to provide these exciting new applications and location-based services to their customers.

There are some initial studies that have shown some changes in the behavior of the dolphins. We're very concerned about the impact that these programs are having both on the individual dolphins themselves and on the dolphin population as a whole.