Wednesday, February 1, 2012
Saab R4 Navigation System Manual Supplement
Saab R4 Navigation System Manual Supplement. This manual is a supplement to the R4 Navigation System Operator’s Manual (7000 109-143 rev. F2). It describes new features implemented in the R4 Navigation Display software version 5.0.96. The R4 Navigation Display, sw version 5.0.94 onwards, can be used for calculation of tidal predictions based on user input of data from the Admiralty Tide Tables published by the U.K Hydrographic Office. The user is required to input data for the specific port and select the point in time for which the prediction is to be calculated. The tidal prediction features in the R4 Navigation Display are centered around three views, the Port List, Tide Plot and Tide Table views available in the Plan Voyage mode. Note that meteorological effects (e.g wind and barometric pressure) as well as other factors not accounted for in the generalized tidal models may cause significant deviation between actual and predicted tide. The tidal predictions are calculated by the so called ‘simplified harmonic method’. Harmonic constants and other parameters required are included in publications below. Note that the algorithms applied are specifically adapted for this data. Tidal parameters obtained from other sources shall not be used with the R4 Navigation Display tidal calculations. Predictions calculated according to this method will not be fully consistent with the tabulated high/low and hourly predictions from the Admiralty tide tables. This is due to the fact that the tabulated values are based on a more extensive data set compared to the limited number of parameters used by the simplified harmonic method The source data is split between volumes with different geographical coverage as follows: UTC offset time zone (UTC time – Local Time) in hours and minutes from ATT part III. This information is important since ATT data is referenced to a local time in port with this offset from UTC. Enter this data as defined in ATT regardless of adjustments for other local time offsets (e.g daylight savings time). See further notes on treatment of time offset in sections below. Position Latitude & longitude of port. This is optional information that not is required for calculation of tide. If entered, the current distance to the actual port will be shown in the list of tidal stations. Position is not listed in ATT part III. ML (Z0) This is mean level in meters from ATT part III. For most stations this is a fixed value. Tables of seasonal corrections and fortnightly variations as required for some stations can be entered as described below.
Download: Saab R4 Navigation System Manual Supplement
