GPSMAP® 6000/7000 Series Owner’s Manual 7RadarDual Range ModeDual Range mode provides a side-by-side view of both short-range and long-range radar data, witha GMR 604 xHD, 606 xHD, 1204 xHD, or 1206 xHD radar. The two radar views provided in thismode can be especially useful at night or in inclement weather.Short-range radar data appears on the left side of the dual-range screen, and the signal range cannotexceed 3 nm (4 km). Long-range radar data appears on the right side of the dual-range screen, andthe signal range must be greater than the signal range shown on the short-range screen. The short-range screen is comparable to Harbor mode, and the long-range screen is comparable to Offshoremode.Note: If you switch from Sentry mode to Dual Range mode, the radar switches to full-timetransmission and disables any guard zones. If you switch from Harbor mode or Offshore mode toDual Range mode, all MARPA targets are cancelled, and you cannot acquire MARPA targets untilyou exit Dual Range mode.Showing Dual Range ModeFrom the Home screen, select Radar > Dual Range.Dual Range ModeShort-range radar Long-range radarSentry ModeSentry mode allows you to put the radar into timed-transmit mode, in which you can configure aradar transmit and standby cycle to conserve power. You can also enable a guard zone in this mode,which identifies a safe zone around your boat and sounds an alarm when a radar object enters thiszone. Sentry mode works with all GMR models.Showing Sentry ModeNote: If you switch to Sentry mode and MARPA is disabled in Sentry mode, all MARPA targetsare cancelled, and you cannot acquire MARPA targets until you exit Sentry mode. If MARPA isenabled in Sentry mode, MARPA targets are not cancelled.From the Home screen, select Radar > Sentry.Enabling MARPA in Sentry ModeFrom the Home screen, select Radar > Sentry > Menu > Sentry Setup > MARPA > on.