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NMEA packets can be had by putting the 3DM-GX3-35 or 3DM-GX3-45 in GPS Direct mode and manipulating the devices with the GPS manufacturer’s software.

Here are two technical notes which show how this is done:

NMEA packets can also be generated in the user's own application by gathering the navigation data output by the 3DM-GX3-35 or 3DM-GX3-45 and formatting it into NMEA packets. The inertial sensor feeds navigation data to the host computer, the host computer formats the navigation data into NMEA packets, and sends them out the serial port to a NMEA-ready device.

No.  Node Commander is a Windows software which requires a standard version of the XP Pro, Vista, Win 7 or Win 8 operating system.  Smart phones do not have these standard operating systems installed.

Node Commander is a Windows software which will operate on XP Pro, Vista, Win 7 and Win 8.  Any computing platform, whether desktop, laptop, tablet, etc. which supports these standard Windows OS can be used for Node Commander.

Plastic shims and shim stock can be acquired from industrial supply houses.

McMaster-Carr offers assortments as shown below.

These may be found at:

Part Number: 9513K42
Type Shim Stock
Material Plastic
Material Type PETG and Polyester
Length x Width 5" x 20"
Specifications Met Not Rated
Assortments Standard Shim Stock
Assortment Type Plastic Assortment - 15 Piece
Assortment Contents 1 each of these thicknesses:
.0005", .00075", .001",
.0015", .002", .003", .004",
.005", .0075",
.010" (±10%); .0125",
.015" (±.001"); .020",
.025", .030" (±5%).

The GPS antenna cable that ships with every 3DM-GX3-35 and 3DM-GX3-45 is 3 meters in length.

Cable length is important.  The longer the cable, the lower the signal strength.  If the user lengthens the cable, the signal strength will diminish.  The loss of signal strength can only be empirically determined by trying out a particular installation.  Loss of signal strength will manifest itself in the number of satellites seen, quality of data reception from satellites, etc.

No.  The GPS Receiver only receives standard GPS signals.  It does not receive Differential GPS (DGPS) signals.  If the user requires DGPS input, the GX3 will accept DGPS via an external feed and in the case of the 3DM-GX3-45, incorporate it in its Kalman filter processing.  To be clear: the on-board GPS will be bypassed in favor of the external GPS.

Wikipedia GPS:

Wikipedia DGPS:

Each device has its own billing plan.  This allows the user to upgrade critical devices to prevent service disruption, and select the plan most appropriate for each device's usage pattern.  Each upgraded device will have its own base charge, and accumulate additional usage charges based on its plan.

When devices on the basic plan reach their maximum MDP, SensorCloud will reject any further data uploads.  Similarly, API calls will be rejected after the allotment is exhausted.  All previously uploaded data remains accessible through fastgraph.  For upgraded devices, SensorCloud will not reject any requests, but will accumulate additional usage costs.  These additional costs are defined in each of the billing plans.  Additional costs will appear at the end of the month when the billing cycle is renewed.

Each SensorCloud billing plan operates on a monthly cycle.  The month begins when the user enters their billing info.  A user can upgrade and downgrade devices at any time in the month.  Upgrades made during a billing cycle will be pro-rated for the remaining days in the billing cycle.  At the end of the billing cycle, all upgraded devices are automatically renewed and MDP and OpenData API allotments are refreshed.

No, the on-board GPS does not support this.... but if the user has a GPS that does, this external GPS can input its 'RTK-groomed' measurements into the 3DM-GX3-45 and the 3DM-GX3-45 will incorporate those measurements into the Kalman filter.  To be clear: the on-board GPS will be bypassed in favor of the external GPS.

Wikipedia's definition:

Real Time Kinematic (RTK) satellite navigation is a technique used to enhance the precision of position data derived from satellite-based positioning systems, being usable in conjunction with GPS, GLONASS and/or Galileo. It uses measurements of the phase of the signal′s carrier wave, rather than the information content of the signal, and relies on a single reference station to provide real-time corrections, providing up to centimetre-level accuracy. With reference to GPS in particular, the system is commonly referred to as Carrier-Phase Enhancement, or CPGPS. It has application in land survey and in hydrographic survey.



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