Then put one or 2 quarts in it dipstick
All kidding aside, if it's anything like the mercury outboards I've owned, there should be a float in the oil tank and when it drops down to a certain level a low oil warning alarm should sound. The reason I know this is because when we'd tilt the engine back to clear the props of fishing line, every once and a while the float would stick. Even though there was plenty of oil in the the float sticking would cause a low oil alarm.
While I'm at it here, one more piece of advice. If your fishing lines ever get tangled up in your prop you need to clear it before putting the engine back in gear. Line, especially braid, can get wrapped behind the prop and ruin the seals on the prop shaft. Once that happens water can get into the lower drive unit, break down the drive oil and could make for a costly repair.
You also need to be cognizant of your engine alarms. They should sound a few beeps when you turn the key in the on position before starting, this way you know they are working. Once you have the engine running there are usually a few reasons they might go off. Low oil or overheating are usually the main culprits. On most 2 strokes this will cause the engine to go into safe mode and will not allow you to go past a certain RPM so you can at least limp your way home hopefully with out causing damage to your engine.
If your engine does ever go into alarm, I would suggest you immediately try and remedy the situation. Put more oil in if it's low or see if you may have picked up a bag or something on the lower unit intakes which would restrict the flow of water. If you can't remedy it, get a tow since you don't want to chance ruining the engine by running it under alarm. Besides, you may as well use that towing insurance and get the experience of getting towed under your belt too
