Acquisition Times: (Average acquisition times for a stationary receiver with a clear view of the sky)

GPSMAP 421/421s

GPSMAP 451/451s

GPSMAP 521/521s

GPSMAP 551/551s

Warm*: Approximately 1 second

Cold**: Approximately 38 seconds GPSMAP 526/526s GPSMAP 556/556s

Warm*: Approximately 15 seconds

Cold**: Approximately 45 seconds

*Warm: your unit is at or near the last location where you recently acquired satellites.

**Cold: your unit has moved by more than about 500 mi. (800 km) since it was turned off.

Update Rate: once per second

GPS Accuracy:

Position: <49 ft. (15 m), 95% typical

Velocity: 0.164 ft./sec 0.05 m/sec steady state

WAAS Accuracy:

Position: <10 ft. (3 m), 95% typical

Velocity: 0.05 m/sec steady state

Dynamics: 6 g

Appendix

Power

Power Source: 10–32 Vdc

Usage: 15 W max at 13.8 Vdc

Fuse: AGC/3AG - 3.0 A

Sonar

Power: 1 kW Transducer, 1,000 W (RMS), 8,000 W (peak to peak)*;

Dual Frequency, 500 W (RMS), 4,000 W (peak to peak) Frequency: 50/200 kHz (dual frequency and 1 kW) Depth: 2,500 ft. (762 m) (1 kW), 1,500 ft. (457 m)**

*1 kW transducers are supported by the GPSMAP 526s and 556s units only.

**Depth capacity is dependent on water salinity, bottom type, and other water conditions.

GPSMAP 400/500 Series Owner’s Manual