This format has the following options: erase, targetlocation, configlog, baud, initbaud, read-at-once, first-sector, last-sector, dump-file, no-output, gps-utc-offset, gps-week-rollover . Serial download protocol for GPS data loggers based on Skytraq Venus 5 and Venus 6 chipsets. This chipset is used by a number of devices from different manufacturers. If your logger came with the Windows software