1. WATER LEVEL OPTIONS

2. Water Level Corrections Water Level Corrections Water Level Above Chart Datum = Negative Tide Correction! In Depth Mode:  Chart Sounding =  Measured Sounding  + Tide Correction  + Draft Correction  + Other Corrections.  The height of the water level relative to the chart datum is called the ‘Tide Correction’ or ‘Water Level’ Correction. (Same thing)  Positive if the Water Level is below the Chart Datum.  Negative if the Water Level is above the chart datum (normal). Water Level Chart Datum Bottom Chart Sounding

3. Real Time Water Level Correction Methods MethodComment Manual Entry in SURVEY For use in a local area Enter TID record at the start of each line and any change. Read an automated Gauge Logs TID record every time the gauge updates, using a Tide Telemetry driver. Read a Predicted Tide File in SURVEY Logs a predicted TID record using the TIDEFILE2.DLL or TIDEDR.DLL device drivers. RTK Tides Has it’s own presentation. These are just the real time options. We’ll see 8 more options for water levels when it comes to post-processing.

4. Setting the Tide Level in SURVEY Click ‘Tide – Set’ menu item in SURVEY. Enter your correction value. SURVEY: Writes the tide change to your RAW data file. AVI

5. RTK Tides ! RTK Tides Has It’s Own Presentation ! Water Line Vessel Static Ref. DH Bottom B Chart Datum CS Ellipsoid Ref. Geoid Ref. (MSL) A T NN-K K  Works with:  GPS.DLL  POSMV.DLL  F180.DLL  NOVATEL.DLL  Valid when GPS Status is:  RTK Fixed  Loads Kinematic Tidal Datum file (KTD) if:  KTD file in project is ‘Enabled’  More on when to use a KTD file coming up.

6. TIDEFILE2.DLL TIDEFILE2.DLL Read Predicted Tide Files (*.TID) Into SURVEY  Tidefile2.DLL:  Nicer display  User can adjust ‘on- the-fly’  Reads *.TID file created in:  MANUAL TIDES  HARMONIC PREDICTION  *.TID file is specified in Setup Window  ‘Connect’ is set to ‘None’