I use a Stanley SLM09. Nice and bright; allows me to pick out buoys/marks really well from quite a distance. Some reviews complain of a short battery life per charge, but if you only use it sparingly (a few seconds at a time), the battery seems to be more than sufficient. It can be plugged in, via a "cigarette lighter" plug, for more extended use.
Never forget them. Do something to prevent it from happening again.
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