來填一個去年沒回填的坑 - 在去年的基礎巡邏技巧文中，曾經提到但沒有詳細介紹的射程卡(Range Card)
射程卡（Range Card）是一種標準化的圖表，用來紀錄一個射手或機槍手的射擊扇區、目標位置、射程數據等。
YTR Echo Mike的影片簡單地說明其基本使用時機 - 假設你與小隊需要在特定位置待超過30分鐘以上，請務製作該區域的射程卡，這不但是為了提升自己交火時的距離判斷效率，也讓與隊友、同僚換防的交接能夠更安全、順利。
你可以找一張白紙隨手繪製，不過可以的話Mike會推薦你上網搜尋A5517美軍制式表格自己輸入，上膠膜保護起來後可以拿簽字筆重複使用、修改。(下載連結請參見原文末)
拿到射程卡後第一件事：定義弧線的間距，Mike建議最簡單的方式是選定你正前方遠處的主要地形或參考建築，評估距離後除以弧線的間隔數量：例如你評估距離最遠的建築約450公尺，再用450除以9得出每隔大概距離50公尺（不過這邊美軍有個標準建議是：主要地形距離在450公尺內，每條間距設定為50公尺；超過451公尺，則每條間距設定為100公尺）。
第二步，填寫位置與使用武器名稱：下半資訊區的左上欄位填入單位的位置，以及使用武器，在美軍的範例中這裡的武器要填入完整型號，例如使用武器為M249 SPW，不能只寫M249必須完整標示SPW，Mike這邊是稍微簡化了。
接著在上半頁上方填入部隊資訊，並填寫確認的磁北方向。
第三步，繪製中央參考線：面對方向的正前方直線，由於影片Mike預設磁北為正前方因此標示為0度線，但一般來說需標示實際的方位角。
接著開始繪圖，評估自己觀察到的地形、地貌特徵的大致距離，以及與參考線間夾角角度，在半圓圖上進行繪製，並註記方位角。繪製完成後，會在下方清單依欄位進行表列。
「不要拍照、不要GPS標記」Mike在影片最後提到，透過肉眼觀察更容易讓自己建立對環境的感知，並強迫自己去思考敵人可能出現的方向，以及自己可能的應變手段。
編輯後記：
射程卡的繪製方式，因為國籍、軍種、時期的關係，網路上有非常多不同的繪製方法。
對於機槍陣地或是狙擊前觀的設置，甚至是標槍飛彈的射程卡，你可能需要更深度的研究(例如需要設定主、次防區、繪製射擊死角、直射/曲射武器射程標示...等等)，但Echo Mike的這支影片提供一般步兵、後備人員一個非常簡單、非常快速的繪製方法。
—English Quick view—
Infantry's Best Friend - Hand-Drawn Range Card Guide
Filling a gap from last year's basic patrol techniques article - the Range Card that was mentioned but not detailed.
What is a Range Card?
A Range Card is a standardized chart used to record a shooter's or machine gunner's sector of fire, target positions, range data, and other relevant information.
When to Use Range Cards?
According to YTR Echo Mike's video explanation: If you and your squad need to stay in a specific position for more than 30 minutes, you should create a range card for that area. This not only improves your distance estimation efficiency during firefights but also makes handovers with teammates and colleagues safer and smoother during position changes.
Creating Your Range Card?
You can use any blank paper to hand-draw one, but Mike recommends searching online for the A5517 US military standard form, filling it out digitally, then laminating it so you can reuse and modify it with markers.
Step-by-Step Instructions
Step 1: Define Arc Intervals
The simplest method Mike suggests is to select a major terrain feature or reference building directly in front of you, estimate the distance, then divide by the number of arc intervals.
Example: If you estimate the farthest building is about 450 meters away, divide 450 by 9 to get approximately 50-meter intervals.
US Military Standard:
If main terrain is within 450 meters: set each interval at 50 meters
If over 451 meters: set each interval at 100 meters
Step 2: Fill in Position and Weapon Information
In the lower information section's upper-left field, enter: Unit position
Weapon being used (complete model designation - e.g., M249 SPW, not just M249)
Then fill in unit information in the upper section and confirm magnetic north direction.
Step 3: Draw Central Reference Line
Draw a straight line directly forward from your facing direction. In Mike's video example, magnetic north is set as the front direction (0-degree line), but normally you should mark the actual azimuth.
Step 4: Begin Sketching
Assess the approximate distances of observed terrain and landscape features, as well as their angles relative to the reference line. Draw these on the semicircular diagram and mark the azimuths. After completing the sketch, list the information in the table below according to the fields.
Important Notes
"No photos, no GPS marking" - Mike emphasizes at the end of his video that observing with the naked eye makes it easier to develop environmental awareness and forces you to think about potential enemy approach directions and your possible response measures.
Editor's Notes
Range card drawing methods vary significantly depending on nationality, military branch, and time period - you'll find many different methods online.
For machine gun positions, sniper observation posts, or even Javelin missile range cards, you may need more in-depth study (such as setting primary/secondary defensive zones, drawing dead space, marking direct/indirect fire weapon ranges, etc.). However, Echo Mike's video provides a very simple and quick drawing method for general infantry and reserve personnel.
A5517表格：https://www.missouriwestern.edu/rotc/wp-content/uploads/sites/71/2018/03/A5517_RangeCard.pdf