Map Acquisition and Waterproofing

Acquiring the Right Maps

USGS 7.5-Minute Quadrangles: The standard for land navigation. 1:24,000 scale. Covers a 7.5-minute square of latitude/longitude (approximately 8 × 7 miles). These are the same maps the military uses for ground navigation training.

• Buy printed: store.usgs.gov ($8-10 each)
• Download free: apps.nationalmap.gov/downloader
• Print custom sections: topoview.usgs.gov (browser-based viewer and downloader)

What to cover:

• Your home location: the 2-4 quads covering your home and 10-mile radius in all directions
• Bug-out routes: all maps along your primary and secondary routes to your destination
• Destination area: maps covering wherever you plan to go

If your destination is 50 miles away, you might need 8-12 quads to cover the full area.

State road atlases (DeLorme/Benchmark): Printed spiral-bound atlases at roughly 1:150,000 scale with good road detail and basic topo. These cover an entire state in one book. Not detailed enough for off-trail navigation, but excellent for vehicle-based navigation. The DeLorme Atlas & Gazetteer series covers all 50 states and costs $20-25 each.

Satellite imagery prints: Google Earth imagery printed via CalTopo provides a different view than topo maps — useful for identifying specific buildings, roads, and landscape features not on topo maps.

Waterproofing Methods

Method 1: Dry Wax Spray (Recommended)

Products like NikWax Map Proof, Atsko Sno-Seal, or Plasti-Kote Map Seal spray a water-repellent coating directly onto paper. The paper absorbs it and remains water-resistant without obscuring the printing.

Application:

1. Lay the map flat on a clean surface
2. Spray both sides evenly from 8-12 inches
3. Allow to dry completely (30-60 minutes per side)
4. Fold and test with a sprinkle of water

Durability: 6-18 months with normal handling before re-application. Still foldable. Still writeable with pencil.

Method 2: Transparent Map Case (Most Protection)

Waterproof transparent pouches (Aloksak, SealLine, or any clear waterproof bag) allow you to use the map through the case. The map is never actually exposed to water.

Best for: active field use in rain. The map stays completely dry. You can fold the map inside the case to show the relevant section.

Limitation: can't write on the map without removing it. Not a permanent solution — it's a use-case specific protector.

Method 3: Contact Paper (DIY Budget Option)

Clear self-adhesive contact paper ($5-10 per roll at hardware stores) applied to both sides of a map provides decent waterproofing.

Application: lay the map face-down on the adhesive side of the contact paper, carefully smooth from the center outward to avoid bubbles, trim excess. Repeat on the other side.

Limitation: bubbles and wrinkles obscure printing if applied carelessly. The adhesive can yellow over years. Not as durable as commercial map waterproofing spray.

Method 4: Lamination (Permanent)

Commercial lamination (clear heat-sealed plastic film) makes a map fully waterproof and tear-resistant. The trade-off: a laminated map can't be folded without eventually cracking the lamination. It also can't be marked with pencil.

Best for: maps you want to display (evacuaion routes posted on a wall) or maps you'll carry folded once and not refold.

Pre-Marking Maps

Before an emergency, mark your maps with information you'll need in the field:

On the map face:

• Your home location (bold mark)
• Water sources you know (streams, springs, tanks)
• Pre-positioned caches
• Rally points
• Structures with known supplies or contacts

In the map margin:

• Declination value and year
• Your personal pace count for 100 meters
• Key phone numbers and radio frequencies

Use permanent marker for marks that should survive rain exposure, even on waterproofed maps.

Storage

Maps go in a waterproof map case stored with your navigation kit. The navigation kit should be accessible within 5 minutes of needing it.

Digital backup on your phone (Gaia GPS, Avenza Maps, CalTopo) with offline areas pre-downloaded before any emergency. Set a calendar reminder to update the offline areas quarterly — mapping data is updated regularly and your offline copy can become stale.