I am national race officer and national judge.
when you are re-locating the mark just a couple of meters, depending on the sea floor (sand, rocks, mud, ...) you can keep the anchor down and pull the anchor over the floor by grabbing the mark. In particular in a current with wind and waves this helps you to not drifting away.
You might want to take a tell tale and a compass with you. Race officers love to learn about wind conditions at marks. Another thing that might be handy is something to sound the depths. Could be a long stick or hand lead.
If you are laying the pin-end (the buoy at the starting line) and are expected to stay there to call boats who are over the line, it is wise to be either anchored in the bearing pin-end/pole on the committee vessel, or have an experienced driver who keeps the vessel in the bearing and a second person observing the line. In this case, if anchored, attach a fender or so to the anchor line. The race officer might want you, on case of a general recall, to pass windward to the fleet with the first substitute, and then you have to rush.
Another thing is wake. Sailors do hate the wake of RIBs passing by too close... Remember that at high speed usually you have less wake.
If you are interested and have time, look into the ISAF race officials manuals, at the end of the page: