POTOMAC RIVER EXTENSION (Marine Chart : US12285_P656)

POTOMAC RIVER EXTENSION marine chart is available as part of iBoating : USA Marine & Fishing App(now supported on multiple platforms including Android, iPhone/iPad, MacBook, and Windows(tablet and phone)/PC based chartplotter.).  

 When you purchase our Nautical Charts App,  you get all the great marine chart app features like fishing spots, along with POTOMAC RIVER EXTENSION marine chart. The Marine Navigation App provides advanced features of a Marine Chartplotter including adjusting water level offset and custom depth shading. Fishing spots and depth contours layers are available in most Lake maps. Nautical navigation features include advanced instrumentation to gather wind speed direction, water temperature, water depth, and accurate GPS with AIS receivers(using NMEA over TCP/UDP). Autopilot support can be enabled during ‘Goto WayPoint’ and ‘Route Assistance’.


Have more questions about the Nautical Chart App? Ask us.



Min Longitude-77.12
Min Latitude38.89
Max Longitude-77.06
Max Latitude38.94
Edition Label 141
Edition Label 21
Edition Label 368
* some Stats may include nearby/connecting waterbodies
Nearby Tide Station Marshall Hall, Md.
Distance from center: 6 km
Weekly High / Low Tide Table
09/22Wed03:30 AM11L cm
09/22Wed09:53 AM82H cm
09/22Wed03:42 PM11L cm
09/22Wed10:12 PM84H cm
09/23Thu04:13 AM13L cm
09/23Thu10:35 AM80H cm
09/23Thu04:17 PM14L cm
09/23Thu10:50 PM83H cm
09/24Fri04:57 AM16L cm
09/24Fri11:17 AM77H cm
09/24Fri04:50 PM16L cm
09/24Fri11:29 PM82H cm
09/25Sat05:40 AM19L cm
09/25Sat12:01 PM73H cm
09/25Sat05:22 PM18L cm
09/26Sun12:08 AM80H cm
09/26Sun06:22 AM22L cm
09/26Sun12:46 PM70H cm
09/26Sun05:55 PM20L cm
09/27Mon12:48 AM79H cm
09/27Mon07:06 AM25L cm
09/27Mon01:32 PM68H cm
09/27Mon06:33 PM22L cm

Marine Wind Meteogram for Lake/Chart

For real time, interactive Marine Wind prediction, download App
Date/TimeSpeed *Dir *
09/23 Thu 06:00PM2.3893.01
09/23 Thu 09:00PM2.51112.95
09/24 Fri 12:00AM2.9150.32
09/24 Fri 03:00AM2.35173.47
09/24 Fri 06:00AM1.65150.59
09/24 Fri 09:00AM2.08139.03
09/24 Fri 12:00PM2.19141.3
09/24 Fri 03:00PM3.44132.74
09/24 Fri 06:00PM3.13133.81
09/24 Fri 09:00PM2.75156.86
09/25 Sat 12:00AM1.36259.83
09/25 Sat 03:00AM0.9131.96
09/25 Sat 06:00AM1162.63
09/25 Sat 09:00AM0.69142.6
09/25 Sat 12:00PM0.6117.62
09/25 Sat 03:00PM1.4873.84
09/25 Sat 06:00PM1.7158.74
09/25 Sat 09:00PM1.8396.64
09/26 Sun 12:00AM0.58206.24
09/26 Sun 03:00AM0.38123.96
09/26 Sun 06:00AM1.43138.62
09/26 Sun 09:00AM2.82134.01
09/26 Sun 12:00PM3.66133.86
09/26 Sun 03:00PM4.4138.72
09/26 Sun 06:00PM4.57131.06
09/26 Sun 09:00PM4148.5
09/27 Mon 12:00AM1.88145.05
09/27 Mon 03:00AM1.6118.71
09/27 Mon 06:00AM1.81107.99
09/27 Mon 09:00AM1.8985.92
09/27 Mon 12:00PM1.5851.76
09/27 Mon 03:00PM3.3748.17
* : UTC Timezone, Speed in meters per sec, and True Direction