# Multi-Unit 1:1

The 1:1 case is not actually a multi-unit case. It is the basic configuration for which the ROVL was designed. All ROVL units can operate in a 1:1 configuration. If a topside GPS is also used, the absolute position of the ROV or diver can be determined.

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The 1:1 case is supported by all Cerulean software. Additionally, users can write their own software to make of of the positional information created.
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<figure><img src="https://content.gitbook.com/content/lN2lfY7yE0hWlcn6W1BS/blobs/Ef6sP3G9pUQg8gq7NPvY/image.png" alt=""><figcaption><p>Canonical Case: One receiver tracking one transmitter on an ROV</p></figcaption></figure>