How do I survey from a jet ski (PWC)?

The CEE JET is a self-contained single beam survey kit for personal watercraft (PWC). It was designed for Sea-Doo PWCs with the LinQ accessory system; other craft are possible with some customisation. A CEESCOPE-R™ echo sounder, a high-capacity battery and a Wi-Fi access point sit in one waterproof case. The operator navigates on a waterproof tablet over Wi-Fi, an SBG Systems Ellipse motion sensor corrects attitude errors, and network RTK corrections can come over the same Wi-Fi link via the Hydromagic NTRIP plugin.

How do I connect to the Wi-Fi?

The Wi-Fi access point is powered by the echo sounder through the waterproof Ethernet cable, so it only runs when the CEESCOPE-R™ is on and Power over Ethernet (PoE) is enabled. A lit ring shows it’s working.

1. Press the battery icon on the home screen to open the POWER menu and enable the 802.3af 48 V PoE. (Labels vary with firmware.)
   • Port 1: 24 V passive PoE on the LEMO socket on the right side, for an external Ubiquiti Bullet radio (range over 1,000 m).
   • Port 2: active 802.3af (48 V) on the Bulgin waterproof RJ45 socket, which powers the CEE JET Wi-Fi module.
2. The radio creates a hotspot any device in range can find, so data can be acquired on a small waterproof tablet, or by a second surveyor on shore. Several connections are supported.
3. Set the tablet’s Wi-Fi adapter to a static IP of 192.168.2.11. Don’t use 192.168.2.1, .2 or .10.

How is the motion sensor set up?

The CEESCOPE-R™ has an integrated motion sensor interface, and the CEE JET is designed for the SBG Ellipse.

• Echo sounder to sensor: selected NMEA 0183 messages at up to 20 Hz.
• Sensor to echo sounder: TSS1 heave, pitch and roll at 20 Hz (preset).
• Mount the sensor precisely on the GNSS pole, X forward to the bow and Y to starboard. Roll is positive starboard down, pitch positive bow up, heave positive up.
• SENSORS menu: set Heave to ENABLE at 115200 baud. A heave value appears at the bottom of the screen when it’s connected.
• With the Ellipse-E, set the heave option to AIDED and output GGA (5 Hz+), RMC (5 Hz+), GST (1 Hz) and ZDA (1 Hz) to the sensor.

Every message gets a precise millisecond time stamp, so position, depth and attitude can all be sent over Wi-Fi with no latency or lag errors. See why time stamps matter.

How do I apply motion correction in Hydromagic?

To see motion live, add Motion to the navigation data view. That doesn’t affect recording: if heave input is enabled on the echo sounder, motion data is recorded automatically, in real time or from imported CEE files.

1. Options › Preferences › Calibration: enable Use Motion Sensor Readings. Pitch and roll are then used to recalculate every sounding’s position.
2. Match the heave, pitch and roll conventions to the sensor set-up.
3. Tick Use beam steering, so corrections only apply when motion exceeds the transducer beam angle (typically 9° on the CEE JET); the transducer is assumed to read the same depth within its beam.
4. Tick Echosounder outputs heave corrected depths and disable heave: the high-rate (10 Hz) RTK GNSS already accounts for heave.

When you generate a sounding file, points are moved to their true position and depth during high pitch and roll. Real-time and RAW data never have motion corrections applied before processing. Review the data and decide whether periods of excessive motion should be removed altogether.

How do I get network RTK on the water?

As well as its built-in UHF radio and raw GNSS logging for PPK, the CEESCOPE-R™ takes NTRIP corrections over Wi-Fi from the tablet. Set the RTCM menu to NETWORK with a format matching the stream (menu options vary by firmware; may just say RTK). In Hydromagic, add the NTRIP Plugin: TCP/IP, host 192.168.2.2, port 3001, then the provider’s host, port, user name and password. Full details are in network RTK (NTRIP) with the CEESCOPE™.

• Tick Send position to NTRIP caster when the service needs your position, for example all VRS subscriptions.
• If the connection drops, select the plugin in Devices, press Configure then OK without changing anything. Restarting Hydromagic also restarts NTRIP.
• The plugin’s Monitor screen: corrections received but not forwarded means a comms problem with the echo sounder (wrong IP, or NETWORK not selected); nothing received usually means a wrong login.
• Set GPS alarms (Preferences › Alarms) to flag lost RTK.

Using HYPACK® instead

An earlier CEESCOPE-R™ PWC set-up used HYPACK® with a Ubiquiti Bullet long-range Wi-Fi radio (over 1 km with a high-gain antenna) and an SBG Ellipse2-E (0.1° roll and pitch, 0.5° heading with GPS, 5 cm real-time heave). Then, only HYPACK® could record the time-stamped motion data. HYPACK® can run on the PWC tablet for normal acquisition, be used just to control recording inside the echo sounder, or both, and a second surveyor on shore can acquire the whole dataset.

That note used the 2018 CEESCOPE.DLL and the custom GPS-CEE driver, both on CEE time. From HYPACK® 2021 Q3 use the GPS-NMEA0183 driver instead; see which HYPACK® drivers to use. The echo sounder passes TSS1 data through, time-stamped and recorded for the software; it doesn’t use it to correct depths itself.