[. . . ] (913) 397. 8200 or (800) 800. 1020 Fax (913) 397. 8282 Garmin (Europe) Ltd. Liberty House Hounsdown Business Park, Southampton, Hampshire, SO40 9RB UK Tel. +44 (0) 870. 8501241 (outside the UK) 0808 2380000 (within the UK) Fax +44 (0) 870. 8501251 Garmin Corporation No. Except as expressly provided herein, no part of this manual may be reproduced, copied, transmitted, disseminated, downloaded or stored in any storage medium, for any purpose without the express prior written consent of Garmin. [. . . ] The speed filter averages the speed of your boat over a short period of time for smoother speed values. GPSMAP 640 Owner's Manual Marine Mode: Advanced Configuration System information--view system information, restore factory settings, view the event log, and save system information. · Factory Settings--erase all user settings and return the device to factory default settings. · Save to Card--only use this option if instructed to do so by a Garmin Product Support Specialist. Touch Wind to toggle between Water (from a water speed sensor) and GPS (from the calculated GPS speed). usage Mode--change to automotive mode. · temperature--set units of measure for temperature to Fahrenheit (ºF) or Celsius (ºC). Note: You must be receiving NMEA sonar depth data and temperature data to view depth and temperature information. Changing Units of Measure From the Home screen, touch Configure > units. System units--specify system-wide units of measure: Statute (mh, ft, ºF), Metric (kh, m, ºC), Nautical (kt, ft, ºF), or Custom. Touch Custom to individually define units of measure for: · Depth--set the units of measure for depth to Feet, Fathoms, or Meters. · Distance--set the units of measure for distance readings (Miles, Kilometers, or Nautical Miles). · Speed--set the units of measure for Vessel Speed and for Wind Speed readings (Miles per Hour, Kilometers per Hour, or Knots). · elevation--set the units of measure for elevation readings (Feet or Meters). · atmospheric pressure--set the units of measure for atmospheric (Millibars or inches of Mercury) pressure readings. · auto Mag Var (Automatic Magnetic Variation)--automatically set the magnetic declination for your location. · user Mag Var--set a custom magnetic variation value. GPSMAP 640 Owner's Manual 4 Marine Mode: Advanced Configuration position Format--select the coordinate system in which a given location reading appears. Do not change the position format unless you are using a map or chart that specifies a different position format. Map Datum--select the coordinate system in which the map is structured. Do not change the map datum unless you are using a map or chart that specifies a different position format. · time Format--set the time format (12 hour, 24 hour, or UTC) for time readings. · time Zone--set the time zone displayed for time readings. · NMea Std. --supports the input or output of standard NMEA 0183 data, DSC, and sonar NMEA input support for the DPT, MTW, and VHW sentences. · NMea High Speed--supports the input or output of high speed 0183 data for most AIS receivers. NMea 0183 Setup--enable or disable NMEA 0183 output for route sentences, system sentences, and adjust Garmin NMEA settings. precision--adjust the number of digits (two Digits, three Digits, or Four Digits) to the right of the decimal point for transmission of NMEA output. · Waypoint iDs--select how the unit outputs waypoint identifiers (Names or Numbers). Configuring Communications Settings From the Home screen, touch Configure > Communications. port types--select the input/output format (garmin Data transfer, NMea Std. [. . . ] route truncated--some points on the end of the route have been discarded. Severe Storm Warning--(XM WX weather) there is a severe storm warning in effect. Shallow Water alarm--(sonar) the boat has entered the userdefined shallow water depth. Sonar Failed, unit Needs repair--there has been a sonar failure and the unit needs to be sent in for repair. [. . . ]