This page allows you to view the results of time and frequency comparisons between members of the Interamerican Metrology System (SIM). By using the forms below, any contributing SIM laboratory can compare their national time and frequency standard to any other SIM laboratory, to UTC(USNO) as obtained through the GPS broadcasts, or to the SIM Time Scale (SIMT).

To view common-view results (for comparisons between two SIM laboratories) complete the form entries and then click the SUBMIT button.

To view all-in-view common-view results (for comparisons between two SIM laboratories) complete the form entries and then click the SUBMIT button. Unlike the "classic" common-view method above, this method does not align individual satellite tracks. It often improves the results over long baselines and makes comparisons possible when no satellites are in common-view. However, it may degrade results slightly over short baselines.

To view GPS - SIMT(k) comparisons, complete the form entries and then click the SUBMIT button. Note that GPS is UTC(USNO) as obtained through the GPS broadcasts.

To view SIMT - SIMT(k) comparisons, complete the form entries and then click the SUBMIT button.

To compare two Network Time Protocol (NTP) servers via the common-view UTC(NIST) method, complete the form entries and then click the SUBMIT button.

To view NTP Server - UTC(NIST) comparisons, complete the form entries and then click the SUBMIT button.