Invalid Mile Markers:

Private: Locks 72-75 (db#7361)
Mile Marker: 174.4-175.5

Private: Locks 69-71 (db#7362)
Mile Marker: 166.5-167.0

Private: Lock 58-60 (db#7363)
Mile Marker: 144.0-149.6

Private: Locks 51-52 (db#7365)
Mile Marker: 122.7-122.9

Big Pool (db#7723)
Mile Marker: 112.1-113.8

Private: Six Locks (db#7405)
Mile Marker: 13.6-14.4

Billy Goat Trail A (db#7404)
Mile Marker: 12.8-13.8

Billy Goat Trail B (db#7400)
Mile Marker: 11.3-12.3

Cabin John (db#7419)
Mile Marker: Canal Town outside of park

Billy Goat Trail C (db#7401)
Mile Marker: 9.9-10.9

Private: Seven Locks (db#7458)
Mile Marker: 8.4-9.5

Glen Echo Park (db#7462)
Mile Marker: Outside of Park

Capital Crescent Trail (db#7397)
Mile Marker: 1.5-3.1

Private: Locks 1-4 (db#7394)
Mile Marker: 0.3-0.4

Invalid or Empty Lat/Long:

Paw Paw (db#38898)
Lat, Long: None

Private: Test POI (db#10425)
Lat, Long: None

Allegany County Historical Society (db#7598)
Lat, Long: None

Passages of the Western Potomac Heritage Area (db#7494)
Lat, Long: None

Lock 75 Picnic Tables (db#7274)
Lat, Long: None

Private: Locks 72-75 (db#7361)
Lat, Long: None

Private: Locks 69-71 (db#7362)
Lat, Long: None

Lock 65: The Missing Lock (db#7376)
Lat, Long: None

Private: Lock 58-60 (db#7363)
Lat, Long: None

Fort Dawson (db#7264)
Lat, Long: None

Private: Locks 51-52 (db#7365)
Lat, Long: None

Four Locks (db#7773)
Lat, Long: None

Thomas Swearingen Ferry & James Rumsey Bridge (db#7909)
Lat, Long: None

James Rumsey Steamboat (db#7371)
Lat, Long: None

Antietam Battlefield (db#7923)
Lat, Long: None

Dargan Bend Recreation Area (db#8087)
Lat, Long: None

John Brown’s Raid (db#7969)
Lat, Long: None

Marble Quarry (db#7277)
Lat, Long: None

Great Falls Area (db#7407)
Lat, Long: None

Private: Six Locks (db#7405)
Lat, Long: None

Anglers (db#7426)
Lat, Long: None

Carderock Old (Former Picnic Area) (db#7253)
Lat, Long: None

Private: Seven Locks (db#7458)
Lat, Long: [38.964611], [-77.138363 ]

Lock 8 Restrooms (db#7460)
Lat, Long: None

Fletchers (db#7355)
Lat, Long: None

Georgetown Restrooms (db#7314)
Lat, Long: None

Private: Locks 1-4 (db#7394)
Lat, Long: None