Patent ID: 8412108

Claim:
A method comprising: processing at a first processing frequency in one or more instances of processing, such that each instance of processing is separated by a first processing time period, at least a first signal wherein the first signal is suitable for determining navigational information; increasing the first processing frequency to a second processing frequency and switching from processing the first signal to processing a second signal wherein the second signal is suitable for determining navigational information; determining a parameter indicative of a quality of the first signal; determining a parameter indicative of a quality of the second signal; determining, within the first processing time period measured from a last instance of processing the first signal at the first processing frequency, which one of the first signal and the second signal to process at a next instance of processing by comparing respective parameters of at least the first signal and the second signal; selecting one of at least the first signal and the second signal for the next instance of processing at the first processing frequency, using the determined one of the first signal and the second signal to process, within the first processing time period; determining navigational information from the selected signal; and controlling presentation of the navigational information from the selected signal such that instances of presentation are separated by the first processing time period.