![]() Using the Inertial Labs™ MRU along with the HYPACK hydrographic survey software allows real time data collection and processing for imaging, terrain modeling, and statistical reporting.įor more details about HYPACK software, please visit the website In order to connect MRU to HYPACK it is necessary to do the following: HYPACK is Windows-based software for Hydrographic and Dredging Industries. Graph shows ‘Sync Error’ in mSecs.The Inertial Labs™ MRU family products (MRU-B, MRU-E, and MRU-PD) are compatible with HYPACK software for hydrographic surveys. Located under ‘Utilities – Calibration’ menu item. Test the consistency of your ZDA message for synchronization. Always display the synchronization graph!ġ0 ZDA – 1PPS Testing: Utilities - Calibration - ZDA TEST GPS – Setup – General Tab: Specify if you are using a 1PPS box. Select ONE GPS device to use to synchronize the computer clock to UTC in the HYPACK Configuration page.ĩ 1PPS Configuration: Settings in the GPS.DLL Figure it out !! ZDA Only ZDA and 1 PPS BoxĨ Synch the Computer Clock: HARDWARE Settings If it gets large and stays large, something is wrong. Make sure you monitor the difference between the VERITIME and GPS clocks! The difference should be small (<20mSec) and should work its way towards 0.0 after a spike. With a 1PPS Box: Time of ZDA sentence is based on arrival of 1PPS pulse.Ħ The 1 PPS Box RS232 Out (to computer) 1 PPS Receipt StrobeĪlternates RED/GREEN every 1 second when operating correctly RS232 In (from GPS) Requires ZDA at 1 Hz May also carry 1PPS pulse on Pin 8 or 9 1 PPS In (from GPS) BNC Connector 12VDC In GPS Computer RS-232 Out (GGA, VTG, ZDA) Without 1 PPS Box 12VDC 1 PPS Out Computer 1PPS Box RS-232 Out (GGA, VTG, ZDA) With 1PPS Info on CTS Line GPS RS-232 Out (GGA, VTG, ZDA) With 1 PPS Box Without a 1PPS Box: Time of ZDA sentence is based on the arrival of first character of ZDA transmission. These times are adjusted to local time zone, along with any latency offset entered by the user and used as the time tag for the position.ĥ Clock Synchronization – Part III 1PPS Box GGA and GGK sentences contain their UTC measurement time. When a message arrives from your echosounder, MRU or other non-GPS device: HYPACK SURVEY gets a time tag from the VERITIME clock model, which has been ‘synched’ to UTC less the local time zone offset.ĭevice Message Veritime Action Time Tag ‘ZDA’ from GPS VERITIME Clock Model Adjusted Difference recorded in RAW record ‘GGA’ or ‘GGK’ from GPS Nothing From GGA/GGK sentence Echosounder, gyro and other devices From VERITIME model Clock synchronization is only available when using the GPS.DLL, the POSMV.DLL, the F180.DLL or the Novatel.DLL. When the GGA sentence arrives (any rate): HYPACK SURVEY uses the time tag in the GGA sentence (corrected for local time zone offset) as the position time tag. SURVEY will show a “No Synch” error until it locks on. You should wait one or two minutes after starting HYPACK SURVEY before starting to survey to allow the VERITIME clock model to synch to UTC. It can speed up the VERITIME clock model, or slow it down so that it matches UTC. When the ZDA sentence arrives: (1 Hz only!) HYPACK SURVEY compares the UTC time from the GPS (corrected with the time zone offset) with the time from the VERITIME clock model (HYPACK SURVEY). Synchronize if you plan to use post-processed GPS positions. That’s just about all of them… Synchronize if you plan to use post-processed heave. Synchronize if you have a multibeam that outputs datagrams with UTC time stamps.
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