A receiver will output satellite data prior to providing a valid position report. Be sure to measure the time it takes for the receiver to output a valid position, and not just satellite information in the GGA message. Mode Typical Example Approx. Cold start means the receiver is started without any almanac or ephemeris data. This command removes all almanac and ephemeris data from the receivers internal memory and resets all parameters to their default value.
Most receivers have a similar command.
Warm start removes just the ephemeris and simulates a shorter duration between use and hot start simulates a brief outage of power or satellite visibility. Need to add approach for G8 Hot Start. Need to add definition here. While doing this, you will also become familiar with the command structures for each manufacturer and their capabilities will become more apparent. There are times when satellite signals are temporarily blocked by buildings, overpasses, trees, etc.