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navbe > Navigational Location and Attitude Best EstimateVAP Type(s) > Evaluation

The Navigation Best Estimate (NAVBE) VAP was developed in response to the 2012–2013 Marine ARM GPCI Investigation of Clouds (MAGIC) deployment, the first ship-based deployment of the second ARM Mobile Facility (AMF2). It has since been applied to the 2015 ARM Cloud Aerosol Precipitation Experiment (ACAPEX) deployment and the 2017–2018 Measurements of Aerosols, Radiation, and Clouds over the Southern Ocean (MARCUS) field campaign. A number of instruments on the ships collected Global Positioning System (GPS) and Inertial Navigation System (INS) measurements during MAGIC. The motivation of the NAVBE VAP is to consolidate many different sources of this information in a single, continuous datastream to be used when information is required about ship location and orientation and to provide a more complete estimate than would be available from any one instrument. The result is 10 Hz and 1-minute datastreams reporting ship position and attitude.


The 10 Hz NAVBE VAP consolidates GPS and INS measurements from multiple shipborne instruments into one best estimate datastream. It may be used for ship location and correction of vertically pointing instruments. The 1-min NAVBE1M VAP is produced from the 10 Hz product.



  • Fixed
  • AMF1
  • AMF2
  • AMF3

Data Details

Developed By Tami Toto | Michael Jensen | Mary Jane Bartholomew
Contact Tami Toto
Resource(s) Data Directory
Data format netcdf
Site ACX
Content time range 1 October 2012 - 26 March 2018
Attribute accuracy No formal attribute accuracy tests were conducted.
Positional accuracy Data from the primary data source, nav.a1 is assumed to be accurate. Where data gaps in the default source occur, alternate data sources are used when correlation with nav.a1 within the day is possible. Additional details can be found in the readme provided.
Data Consistency and Completeness Bit QC is used for each variable transformation in an intermediate product. The QC is then summarized in the product available to the user.
Access Restriction No access constraints are associated with this data.
Use Restriction No use constraints are associated with this data.
File naming convention Standard ARM naming convention


Dorsey KS, R Jundt, CB Ireland, MR Wasem, RA Stafford, and A Hunzinger. 2021. 2020 Atmospheric Radiation Measurement (ARM) Annual Report. Ed. by Kathryn Dorsey, U.S. Department of Energy. DOE/SC-ARM-20-020.

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