In one sentence, describe what the following article is about: It's the green app with a white phone icon on it. If you haven't yet set up WhatsApp, do so before continuing. This option is in the top-left corner of the screen. You'll see a list of your existing chat conversations appear. If WhatsApp opens to a conversation, first tap the "Back" button in the top-left corner of the screen. Doing so will open the conversation with the corresponding contact. You can also tap the green "New Message" icon in the bottom-right corner of the "Chats" page and then select a contact to create a new message. It's in the bottom-right corner of the screen, just left of the overflow stack of dots. You'll see this in the bottom row of options in the drop-down menu at the top of the screen. It's just below the map that's near the top of the screen. Doing so will send a map to your contact with an indicator showing your location.
Summary: Open WhatsApp. Tap the Chats tab. Tap a conversation. Tap the paperclip icon. Tap Location. Tap Send your current location.

In one sentence, describe what the following article is about: If you are sleep deprived, you may feel tired all the time. You may yawn often during the day and find it hard to stay awake when you are doing tasks. You may feel groggy in the morning or throughout the day. You may find yourself dozing off at random times, especially during meetings, while watching television, or even when driving. Another symptom of sleep deprivation is a lack of mental alertness. This means you may have trouble concentrating, you may not think as clearly, your memory may be weaker than usual, or you may have decreased reaction time. Many accidents occur due to lack of mental alertness due to sleep deprivation. Sleep deprivation can cause all of your thought processes to work slower and not as efficiently as when you are fully rested. Sleep deprivation can lead to a lowered immune system. This can cause you to get sick more often because your body is unable to fight off bacteria, viruses, and other diseases. Sleep deprivation can also cause you to get better more slowly that if you were rested. If you have been getting sick often, or if you are unable to kick a cold or other condition, you may be sleep deprived.
Summary: Decide if you are always tired. Determine if you are mentally alert. Figure out if you are getting sick more often.

In one sentence, describe what the following article is about: Scales are expressed as ratios and differ from map to map. The scale, printed in the upper right corner of the map, will look something like 1:100,000. A ratio of 1:10,000 indicates that every 1in (2.5cm) the map equals 10,000in (25,000cm) in the real world. Charts with smaller scales provide an up-close view, depicting more area details and markers. If you're familiar with land maps, the scale works the same way there. A harbor chart is an example of a small scale chart. Navigators need a close view of the harbor with all the obstructions and other details. Larger charts show land and waterways but few additional details. Look in the upper right corner of the map near the scale. You will see the unit of measurement printed in big letters. You need to know this because charts use all sorts of different measurements. Your chart could include feet, fathoms, or meters. In the U.S., charts generally use feet or fathoms. However, the National Oceanic and Atmospheric Administration (NOAA) has begun converting its charts to meters for the sake of international consistency. The black numbers printed on the chart represent water depth. Each number indicates the "mean lower low water" (MLLW) in an area. This is the average water depth at low tide, so most of the time the water is deeper than what you see on a chart. If you see a negative number, that means the water depth in the area is typically less than what is listed on the chart. Numbers written in fathoms have a unique look to them, so they are easy to spot. A fathom listing often consists of a pair of numbers. The first number indicates the number of fathoms. The second number, which will be a small subscript, is the number of additional feet. For example, a listing of 0 and 3 means a depth of 0 fathoms, 3 feet. A listing of 3 and 2 means 3 fathoms, 2 feet, or 20 feet total. For uniformity and simplicity, many modern charts use meters. This can be tough to understand if you're used to measurements in feet or fathoms. Multiplying by 3 is a quick way to get a relatively accurate estimate of the water's depth. For example, multiply a listing of 6 meters by 3 to estimate it as being at least 18 feet deep. The actual depth is 6 metres (20ft), so it isn't completely accurate, but it is helpful for avoiding shallow areas. If the depths are listed in feet, you can also divide them by 3 to quickly convert them to meters.
Summary:
Use the scale indicator to track distance on a chart. Find the unit of measurement used to indicate water depth. Read the chart numbers to figure out the water's lowest depth. Multiply fathoms by 6 to measure depths by feet. Multiply meter measurements by 3 to convert them to feet.