Explorer B-51 · Bracket mount
2¾-in direct-reading dial; position or remove the compass with bracket thumbscrews.
Check item, condition and availabilityRitchie Marine Compasses: Bracket, Flush & Surface Mounts
Replacing a magnetic compass at the boat's helm? Compare the mounting style, panel opening and dial before choosing by appearance. Ritchie makes bracket, surface and flush models, and similar-looking models can need different installations.
Three ways a Ritchie compass can mount
Bracket mountingUseful on a mounting surface where you want to adjust the viewing angle. The B-51 uses removable thumbscrews and does not use the same round cutout as a flush-mount model.
Surface mountingThe S-53 has a compact, low-profile surface installation with a push-button compass-release design.
Model number, dial and mounting comparison
| MPN | Mounting | Dial size / type | Panel opening or main difference |
|---|---|---|---|
| B-51 | Bracket | 2¾ in, direct reading | Adjustable bracket and thumbscrews |
| S-53 | Surface | 2¾ in, direct reading | Low profile with quick-removal mechanism |
| F-50 | Flush | 2¾ in, direct reading | 3¾-in round mounting hole |
| F-82 | Flush | 3 in, PowerDamp | 3½-in hole; follow Ritchie template for screw-boss clearance |
| FN-201 | Flush | 4½ in, open-face | 4¾–5⅛-in mounting hole |
| SS-1002 | Flush | 3¾ in, PowerDamp Plus | 4-in mounting hole; optional adapter rings for selected larger holes |
What to check on the existing helm
- Read the current compass model number, if visible, before removing it.
- Identify bracket, surface or flush installation; these are not direct substitutes simply because their dial sizes match.
- Measure the actual panel opening and compare the bezel, mounting-screw locations, depth and clearance to the exact Ritchie mounting template.
- Check electrical wiring for any model with illumination, as well as the compass's allowable mounting orientation.
- Keep the compass away from magnetic interference and follow the manufacturer's instructions for installation and compensation.
Important F-82 detail: Ritchie notes that a 3½-in opening may require the body to be offset or notched for the protruding screw boss. The full template and screw positions matter as much as the nominal hole diameter. Likewise, do not assume an adapter ring is included with SS-1002; Ritchie lists the matching ring as a separate accessory.
Quick answers for common replacements
Does a bigger dial mean a bigger cutout? Not always. The F-82's 3-in dial uses a nominal 3½-in opening, while F-50 has a smaller 2¾-in dial but a 3¾-in opening.
Is a black model interchangeable with a white one? Matching model families may offer colour variants, but compare the full suffix, mounting hardware and light requirements instead of selecting by colour alone.
Can I install a bracket compass in an old flush-mount hole? The bracket may mount to a suitable new surface or panel, but it does not inherently fill or cover a former round compass cutout. Check the mounting arrangement first.
Compare available Ritchie compass listings
These are separate store products. Check the current listing for its actual condition, included components and availability before ordering; the photographs are catalog images, not proof of an individual item's condition.
Explorer S-53 · Surface mount
2¾-in direct-reading dial; low-profile body and push-button compass removal.
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Explorer F-50 · Flush mount
2¾-in direct-reading dial; 3¾-in round mounting opening.
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Voyager F-82 · Flush mount
3-in PowerDamp flat dial; 3½-in opening with installation-specific clearance checks.
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Navigator FN-201 · Flush mount
4½-in open-face dial; 4¾ to 5⅛-in installation opening.
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SuperSport SS-1002 · Flush mount
3¾-in PowerDamp Plus blue dial; 4-in opening, with optional adapter for some larger existing holes.
Check item, condition and availabilityOther marine reference guides
For helm and deck electrical components, consult our Attwood navigation light and base identification guide. Navigation lights and a heading compass perform different functions and have different installation requirements.
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