Starting from the UCSC Genome Browser:

Go to the UCSC Genome Bioinformatics page and click on "Genome Browser". Clicking on on Genome Browser will bring you to the Mouse Genome Browser Gateway page. Click on the "Add Your Own Custom Tracks" button.

Enter the address http://baygenomics.ucsf.edu/blattrack/baygenomics.psl in the empty field and click the Submit button.

The BayGenomics track is displayed under "Custom Tracks". BayGenomics gene traps can now be displayed on the UCSC Genome Browser.